diff --git a/server/package.json b/server/package.json
index 83d3f9cd9..dd2e47a3f 100644
--- a/server/package.json
+++ b/server/package.json
@@ -83,7 +83,7 @@
 		"rimraf": "3.0.2",
 		"safe-json-stringify": "1.2.0",
 		"seq-logging": "^1.1.1",
-		"tachi-common": "0.3.16",
+		"tachi-common": "0.3.17",
 		"ts-node": "10.0.0",
 		"typescript": "4.3.4",
 		"winston": "3.3.3",
diff --git a/server/pnpm-lock.yaml b/server/pnpm-lock.yaml
index fd4000f6a..399ae5cdf 100644
--- a/server/pnpm-lock.yaml
+++ b/server/pnpm-lock.yaml
@@ -63,7 +63,7 @@ specifiers:
   safe-json-stringify: 1.2.0
   seq-logging: ^1.1.1
   supertest: 6.1.3
-  tachi-common: 0.3.16
+  tachi-common: 0.3.17
   tap: 15.0.9
   ts-node: 10.0.0
   tsconfig-paths: 3.10.1
@@ -107,7 +107,7 @@ dependencies:
   rimraf: 3.0.2
   safe-json-stringify: 1.2.0
   seq-logging: 1.1.1
-  tachi-common: 0.3.16
+  tachi-common: 0.3.17
   ts-node: 10.0.0_83f53b0a0c5616d3fa00ed4e30b9ce1b
   typescript: 4.3.4
   winston: 3.3.3
@@ -5387,8 +5387,8 @@ packages:
       strip-ansi: 6.0.0
     dev: true
 
-  /tachi-common/0.3.16:
-    resolution: {integrity: sha512-cCTD+gKWRvOuQAUEf9MNkIAt961JKu/pHOF/Sw+OoMNxAQfiJ9qwjsIF9YXBX16r0q+Olh1Ps+ImaP3j5/PLRQ==}
+  /tachi-common/0.3.17:
+    resolution: {integrity: sha512-YL5UlTT5qHSaAzIbSgz2UzagTE9HV++C0XVAopFg8wYwUei2b1R5shwXgzyO0RtZgqVT0ivz2ug+jx+RN37pCw==}
     dependencies:
       monk: 7.3.4
     transitivePeerDependencies:
diff --git a/server/src/lib/score-import/import-types/common/types.ts b/server/src/lib/score-import/import-types/common/types.ts
index 05a085e5b..42caab878 100644
--- a/server/src/lib/score-import/import-types/common/types.ts
+++ b/server/src/lib/score-import/import-types/common/types.ts
@@ -21,6 +21,7 @@ import { BeatorajaContext, BeatorajaScore } from "../ir/beatoraja/types";
 import { FervidexStaticContext, FervidexStaticScore } from "../ir/fervidex-static/types";
 import { FervidexContext, FervidexScore } from "../ir/fervidex/types";
 import { KsHookSV3CContext, KsHookSV3CScore } from "../ir/kshook-sv3c/types";
+import { LR2HookContext, LR2HookScore } from "../ir/lr2hook/types";
 import { IRUSCContext } from "../ir/usc/types";
 import { KaiContext } from "./api-kai/types";
 import { BatchManualContext } from "./batch-manual/types";
@@ -41,6 +42,7 @@ export interface ImportTypeDataMap {
 	"ir/beatoraja": BeatorajaScore;
 	"ir/usc": USCClientScore;
 	"ir/kshook-sv3c": KsHookSV3CScore;
+	"ir/lr2hook": LR2HookScore;
 
 	// These aren't placeholder values - the data is yielded in a way that
 	// the value of these is legitimately unknown at convert time.
@@ -68,6 +70,7 @@ export interface ImportTypeContextMap {
 	"ir/beatoraja": BeatorajaContext;
 	"ir/usc": IRUSCContext;
 	"ir/kshook-sv3c": KsHookSV3CContext;
+	"ir/lr2hook": LR2HookContext;
 
 	"api/arc-iidx": EmptyObject;
 	"api/arc-sdvx": EmptyObject;
diff --git a/server/src/lib/score-import/import-types/converters.ts b/server/src/lib/score-import/import-types/converters.ts
index acf58c102..15b56ddde 100644
--- a/server/src/lib/score-import/import-types/converters.ts
+++ b/server/src/lib/score-import/import-types/converters.ts
@@ -14,6 +14,7 @@ import { ConverterIRBeatoraja } from "./ir/beatoraja/converter";
 import { ConverterIRFervidexStatic } from "./ir/fervidex-static/converter";
 import { ConverterIRFervidex } from "./ir/fervidex/converter";
 import { ConverterIRKsHookSV3C } from "./ir/kshook-sv3c/converter";
+import { ConverterLR2Hook } from "./ir/lr2hook/converter";
 import { ConverterIRUSC } from "./ir/usc/converter";
 
 export type ConverterMap = {
@@ -43,4 +44,5 @@ export const Converters: ConverterMap = {
 	"ir/direct-manual": ConverterBatchManual,
 	"ir/usc": ConverterIRUSC,
 	"ir/kshook-sv3c": ConverterIRKsHookSV3C,
+	"ir/lr2hook": ConverterLR2Hook,
 };
diff --git a/server/src/lib/score-import/import-types/ir/lr2hook/converter.test.ts b/server/src/lib/score-import/import-types/ir/lr2hook/converter.test.ts
new file mode 100644
index 000000000..ec70ad485
--- /dev/null
+++ b/server/src/lib/score-import/import-types/ir/lr2hook/converter.test.ts
@@ -0,0 +1,61 @@
+import CreateLogCtx from "lib/logger/logger";
+import t from "tap";
+import ResetDBState from "test-utils/resets";
+import { TestingLR2HookScore } from "test-utils/test-data";
+import { ConverterLR2Hook } from "./converter";
+
+const logger = CreateLogCtx(__filename);
+
+t.test("#ConverterLR2Hook", (t) => {
+	t.beforeEach(ResetDBState);
+
+	t.test("Should match a score with its song and chart.", async (t) => {
+		const res = await ConverterLR2Hook(
+			TestingLR2HookScore,
+			{ timeReceived: 10 },
+			"ir/lr2hook",
+			logger
+		);
+
+		t.hasStrict(res, {
+			song: {
+				id: 27339,
+			},
+			chart: {
+				chartID: "88eb6cc5683e2740cbd07f588a5f3db1db8d467b",
+				data: {
+					hashMD5: TestingLR2HookScore.md5,
+				},
+			},
+			dryScore: {
+				scoreData: {
+					score: TestingLR2HookScore.scoreData.exScore,
+				},
+				game: "bms",
+				importType: "ir/lr2hook",
+				scoreMeta: {
+					client: "LR2",
+				},
+			},
+		});
+
+		t.end();
+	});
+
+	t.test("Should throw an error if song or chart can't be found.", (t) => {
+		t.rejects(
+			() =>
+				ConverterLR2Hook(
+					Object.assign({}, TestingLR2HookScore, { md5: "nonsense_md5" }),
+					{ timeReceived: 10 },
+					"ir/lr2hook",
+					logger
+				),
+			"Should throw a KTDataNotFoundError if chart can't be found."
+		);
+
+		t.end();
+	});
+
+	t.end();
+});
diff --git a/server/src/lib/score-import/import-types/ir/lr2hook/converter.ts b/server/src/lib/score-import/import-types/ir/lr2hook/converter.ts
new file mode 100644
index 000000000..036bc8e6e
--- /dev/null
+++ b/server/src/lib/score-import/import-types/ir/lr2hook/converter.ts
@@ -0,0 +1,86 @@
+import { Lamps } from ".pnpm/tachi-common@0.3.16/node_modules/tachi-common";
+import {
+	InternalFailure,
+	KTDataNotFoundFailure,
+} from "lib/score-import/framework/common/converter-failures";
+import { GenericGetGradeAndPercent } from "lib/score-import/framework/common/score-utils";
+import { DryScore } from "lib/score-import/framework/common/types";
+import { FindBMSChartOnHash } from "utils/queries/charts";
+import { FindSongOnID } from "utils/queries/songs";
+import { ConverterFunction } from "../../common/types";
+import { LR2HookContext, LR2HookScore } from "./types";
+
+export const ConverterLR2Hook: ConverterFunction<LR2HookScore, LR2HookContext> = async (
+	data,
+	context,
+	importType,
+	logger
+) => {
+	const chart = await FindBMSChartOnHash(data.md5);
+
+	if (!chart) {
+		throw new KTDataNotFoundFailure(
+			`Could not find chart with md5 ${data.md5}.`,
+			importType,
+			data,
+			context
+		);
+	}
+
+	const song = await FindSongOnID("bms", chart.songID);
+
+	if (!song) {
+		logger.severe(`Song ${chart.songID} (bms) has no parent song?`);
+		throw new InternalFailure(`Song ${chart.songID} (bms) has no parent song?`);
+	}
+
+	const { percent, grade } = GenericGetGradeAndPercent("bms", data.scoreData.exScore, chart);
+
+	const dryScore: DryScore<"bms:7K" | "bms:14K"> = {
+		game: "bms",
+		service: "LR2Hook",
+		comment: null,
+		importType: "ir/lr2hook",
+		timeAchieved: context.timeReceived,
+		scoreData: {
+			score: data.scoreData.exScore,
+			percent,
+			grade,
+			lamp: ConvertLamp(data.scoreData.lamp),
+			judgements: {
+				pgreat: data.scoreData.pgreat,
+				great: data.scoreData.great,
+				good: data.scoreData.good,
+				bad: data.scoreData.bad,
+				poor: data.scoreData.poor,
+			},
+			hitMeta: {
+				bp: data.scoreData.bad + data.scoreData.poor,
+				maxCombo: data.scoreData.maxCombo,
+				gauge: data.scoreData.hpGraph[999] ?? 0,
+			},
+		},
+		scoreMeta: {
+			client: "LR2",
+		},
+	};
+
+	return { song, chart, dryScore };
+};
+
+function ConvertLamp(lamp: LR2HookScore["scoreData"]["lamp"]): Lamps["bms:7K" | "bms:14K"] {
+	switch (lamp) {
+		case "EASY":
+			return "EASY CLEAR";
+		case "FAIL":
+			return "FAILED";
+		case "FULL COMBO":
+			return "FULL COMBO";
+		case "HARD":
+			return "HARD CLEAR";
+		case "NO PLAY":
+			return "NO PLAY";
+		case "NORMAL":
+			return "CLEAR";
+	}
+}
diff --git a/server/src/lib/score-import/import-types/ir/lr2hook/parser.test.ts b/server/src/lib/score-import/import-types/ir/lr2hook/parser.test.ts
new file mode 100644
index 000000000..24b3d4b3b
--- /dev/null
+++ b/server/src/lib/score-import/import-types/ir/lr2hook/parser.test.ts
@@ -0,0 +1,92 @@
+import CreateLogCtx from "lib/logger/logger";
+import t from "tap";
+import { ParseLR2Hook } from "./parser";
+import deepmerge from "deepmerge";
+import { TestingLR2HookScore } from "test-utils/test-data";
+import { ApplyNTimes } from "utils/misc";
+
+const logger = CreateLogCtx(__filename);
+
+t.test("#ParseLR2Hook", (t) => {
+	const assertFail = (data: any, message: string) => {
+		t.throws(() => ParseLR2Hook(data, logger), message);
+	};
+
+	const assertSuccess = (data: any, message: string) => {
+		try {
+			t.doesNotThrow(() => ParseLR2Hook(data, logger), message);
+
+			const res = ParseLR2Hook(data, logger);
+
+			t.equal(res.game, "bms");
+			t.type(res.context.timeReceived, "number");
+			t.ok(Array.isArray(res.iterable));
+			t.equal(res.classHandler, null);
+		} catch (err) {
+			t.fail(`[${message}] ${err.message}`);
+		}
+	};
+
+	const dm = (data: any) => deepmerge(TestingLR2HookScore, data);
+	const dms = (data: any) =>
+		deepmerge(
+			TestingLR2HookScore,
+			{ scoreData: data },
+			{
+				arrayMerge: (a, b) => b,
+			}
+		);
+
+	assertSuccess(TestingLR2HookScore, "Should parse a valid score.");
+	assertSuccess(
+		dm({ unexpectedField: "foo" }),
+		"Should allow excess keys that we do not recognise."
+	);
+	assertSuccess(
+		dm({ scoreData: { unexpectedField: "foo" } }),
+		"Should allow excess keys inside scoreData that we do not recognise."
+	);
+
+	assertFail({}, "Should reject an empty object");
+
+	for (const key of [
+		"pgreat",
+		"good",
+		"bad",
+		"poor",
+		"great",
+		"maxCombo",
+		"exScore",
+		"notesTotal",
+		"notesPlayed",
+	]) {
+		assertFail(dms({ [key]: -1 }), `Should reject negative ${key}`);
+		assertFail(dms({ [key]: 0.5 }), `Should reject decimal ${key}`);
+		assertFail(dms({ [key]: "0" }), `Should reject string ${key}`);
+		assertFail(dms({ [key]: null }), `Should reject nonsense ${key}`);
+	}
+
+	assertFail(dms({ lamp: "UNKNOWN_LAMP" }), "Should reject unknown lamp.");
+	assertFail(dms({ lamp: null }), "Should reject null lamp.");
+	assertFail(dms({ lamp: undefined }), "Should reject no lamp.");
+
+	assertFail(
+		dms({ hpGraph: ApplyNTimes(999, () => 50) }),
+		"Should disallow hp graph with <1000 elements."
+	);
+	assertFail(dms({ hpGraph: [] }), "Should disallow hp graph with 0 elements.");
+	assertFail(
+		dms({ hpGraph: ApplyNTimes(1001, () => 50) }),
+		"Should disallow hp graph with >1000 elements."
+	);
+	assertFail(
+		dms({ hpGraph: ApplyNTimes(1000, () => 101) }),
+		"Should disallow hp graph with elements larger than 100."
+	);
+	assertFail(
+		dms({ hpGraph: ApplyNTimes(1000, () => -1) }),
+		"Should disallow hp graph with negative element values."
+	);
+
+	t.end();
+});
diff --git a/server/src/lib/score-import/import-types/ir/lr2hook/parser.ts b/server/src/lib/score-import/import-types/ir/lr2hook/parser.ts
new file mode 100644
index 000000000..5676497ca
--- /dev/null
+++ b/server/src/lib/score-import/import-types/ir/lr2hook/parser.ts
@@ -0,0 +1,59 @@
+import { KtLogger } from "lib/logger/logger";
+import { ParserFunctionReturns } from "../../common/types";
+import { LR2HookContext, LR2HookScore } from "./types";
+import p, { PrudenceSchema } from "prudence";
+import ScoreImportFatalError from "lib/score-import/framework/score-importing/score-import-error";
+import { FormatPrError } from "utils/prudence";
+
+const PR_LR2Hook: PrudenceSchema = {
+	md5: "string",
+	scoreData: {
+		pgreat: p.isPositiveInteger,
+		great: p.isPositiveInteger,
+		good: p.isPositiveInteger,
+		bad: p.isPositiveInteger,
+		poor: p.isPositiveInteger,
+		maxCombo: p.isPositiveInteger,
+		exScore: p.isPositiveInteger,
+		moneyScore: p.isPositiveInteger,
+		notesTotal: p.isPositiveInteger,
+		notesPlayed: p.isPositiveInteger,
+		lamp: p.isIn("NO PLAY", "FAIL", "EASY", "NORMAL", "HARD", "FULL COMBO"),
+		hpGraph: (self) => {
+			if (!Array.isArray(self)) {
+				return "Expected an array";
+			}
+			if (self.length !== 1000) {
+				return "Expected an array with length 1000.";
+			}
+			if (self.some((x) => x < 0 || x > 100 || !Number.isInteger(x))) {
+				return "Expected an array of 1000 integers between 0 and 100.";
+			}
+
+			return true;
+		},
+	},
+};
+
+export function ParseLR2Hook(
+	body: Record<string, unknown>,
+	logger: KtLogger
+): ParserFunctionReturns<LR2HookScore, LR2HookContext> {
+	// Ignore excess keys, as lr2hook is likely to add more features in the future.
+	const err = p(body, PR_LR2Hook, undefined, { allowExcessKeys: true });
+
+	if (err) {
+		throw new ScoreImportFatalError(400, FormatPrError(err));
+	}
+
+	const score = body as unknown as LR2HookScore;
+
+	return {
+		game: "bms",
+		iterable: [score],
+		context: {
+			timeReceived: Date.now(),
+		},
+		classHandler: null,
+	};
+}
diff --git a/server/src/lib/score-import/import-types/ir/lr2hook/types.ts b/server/src/lib/score-import/import-types/ir/lr2hook/types.ts
new file mode 100644
index 000000000..59ff88010
--- /dev/null
+++ b/server/src/lib/score-import/import-types/ir/lr2hook/types.ts
@@ -0,0 +1,23 @@
+import { integer } from "tachi-common";
+
+export interface LR2HookScore {
+	md5: string;
+	scoreData: {
+		pgreat: integer;
+		great: integer;
+		good: integer;
+		bad: integer;
+		poor: integer;
+		maxCombo: integer;
+		exScore: integer;
+		moneyScore: integer;
+		notesTotal: integer;
+		notesPlayed: integer;
+		lamp: "NO PLAY" | "FAIL" | "EASY" | "NORMAL" | "HARD" | "FULL COMBO";
+		hpGraph: integer[];
+	};
+}
+
+export interface LR2HookContext {
+	timeReceived: number;
+}
diff --git a/server/src/lib/score-import/import-types/parsers.ts b/server/src/lib/score-import/import-types/parsers.ts
index 842781a87..b0d554b3a 100644
--- a/server/src/lib/score-import/import-types/parsers.ts
+++ b/server/src/lib/score-import/import-types/parsers.ts
@@ -17,6 +17,7 @@ import ParseDirectManual from "./ir/direct-manual/parser";
 import { ParseFervidexStatic } from "./ir/fervidex-static/parser";
 import { ParseFervidexSingle } from "./ir/fervidex/parser";
 import { ParseKsHookSV3C } from "./ir/kshook-sv3c/parser";
+import { ParseLR2Hook } from "./ir/lr2hook/parser";
 import { ParseIRUSC } from "./ir/usc/parser";
 
 export const Parsers = {
@@ -42,4 +43,5 @@ export const Parsers = {
 	"ir/direct-manual": ParseDirectManual,
 	"ir/usc": ParseIRUSC,
 	"ir/kshook-sv3c": ParseKsHookSV3C,
+	"ir/lr2hook": ParseLR2Hook,
 };
diff --git a/server/src/test-utils/test-data.ts b/server/src/test-utils/test-data.ts
index abeb8b1b9..23d924437 100644
--- a/server/src/test-utils/test-data.ts
+++ b/server/src/test-utils/test-data.ts
@@ -10,6 +10,7 @@ import {
 import { DryScore } from "lib/score-import/framework/common/types";
 import { BarbatosScore } from "lib/score-import/import-types/ir/barbatos/types";
 import { KsHookSV3CScore } from "lib/score-import/import-types/ir/kshook-sv3c/types";
+import { LR2HookScore } from "lib/score-import/import-types/ir/lr2hook/types";
 import path from "path";
 import { USCClientScore } from "server/router/ir/usc/_playtype/types";
 import {
@@ -22,6 +23,7 @@ import {
 	SongDocument,
 	UserGoalDocument,
 } from "tachi-common";
+import { ApplyNTimes, RFA } from "utils/misc";
 
 const file = (name: string) => path.join(__dirname, "/test-data", name);
 
@@ -41,6 +43,24 @@ export const TestingIIDXSPScore = GetKTDataJSON(
 
 export const TestingKsHookSV3CScore = GetKTDataJSON("./kshook-sv3c/base.json") as KsHookSV3CScore;
 
+export const TestingLR2HookScore: LR2HookScore = {
+	md5: "38616b85332037cc12924f2ae2840262",
+	scoreData: {
+		pgreat: 1000,
+		great: 500,
+		good: 100,
+		bad: 50,
+		poor: 25,
+		exScore: 2500,
+		maxCombo: 50,
+		moneyScore: 150_000,
+		notesTotal: 2256,
+		notesPlayed: 2256,
+		lamp: "HARD",
+		hpGraph: ApplyNTimes(1000, () => RFA([100, 50, 80, 0])),
+	},
+};
+
 export const Testing511SPA = GetKTDataJSON("./tachi/iidx-511spa.json") as ChartDocument<"iidx:SP">;
 
 export const Testing511Song = GetKTDataJSON("./tachi/iidx-511-song.json") as SongDocument<"iidx">;
diff --git a/server/src/utils/misc.ts b/server/src/utils/misc.ts
index 67f00cfbb..2d6563d10 100644
--- a/server/src/utils/misc.ts
+++ b/server/src/utils/misc.ts
@@ -37,7 +37,7 @@ export function MStoS(ms: number) {
 /**
  * Random From Array - Selects a random value from an array.
  */
-export function RFA(arr: unknown[]) {
+export function RFA<T>(arr: T[]): T {
 	return arr[Math.floor(Math.random() * arr.length)];
 }
 
@@ -133,3 +133,12 @@ export function Sleep(ms: number) {
 export function GetTimeXHoursAgo(hours: integer) {
 	return Date.now() - ONE_HOUR * hours;
 }
+
+export function ApplyNTimes<T>(n: integer, fn: (i: integer) => T): T[] {
+	const arr = [];
+	for (let i = 0; i < n; i++) {
+		arr.push(fn(i));
+	}
+
+	return arr;
+}