diff --git a/database-seeds/scripts/rerunners/stepmania/apply-zkldijson.js b/database-seeds/scripts/rerunners/stepmania/apply-zkldijson.js
new file mode 100644
index 000000000..4ca38ed4c
--- /dev/null
+++ b/database-seeds/scripts/rerunners/stepmania/apply-zkldijson.js
@@ -0,0 +1,127 @@
+const { CreateChartID, MutateCollection, ReadCollection } = require("../../util");
+const { Command } = require("commander");
+const fs = require("fs");
+
+const program = new Command();
+program.option("-f, --file <zkldi.json>");
+program.option("-a, --append");
+
+program.parse(process.argv);
+const options = program.opts();
+
+const data = JSON.parse(fs.readFileSync(options.file, "utf-8"));
+
+let freshID = ReadCollection("songs-itg.json").length;
+
+const songs = [];
+const charts = [];
+
+const ids = {};
+const defs = {};
+
+for (const [key, d] of Object.entries(data)) {
+	const [gamemode, pack, filename, diff] = key.split("/");
+
+	if (gamemode !== "Dance_Single") {
+		continue;
+	}
+
+	let eastCoast = false;
+	// only parse these for now
+	if (pack.startsWith("ECS") || pack.startsWith("Stamina RPG")) {
+		eastCoast = true;
+	} else if (pack.startsWith("The Starter Pack of Stamina")) {
+		eastCoast = false;
+	} else {
+		continue;
+	}
+
+	let difficulty = d.difficulty.split("_")[1];
+
+	let title;
+
+	if (eastCoast) {
+		// parses
+		// [16] [160] Song Title (Hard)
+		// into a real form
+		// but obviously dont parse
+		// [16] [160] Song Title (Restep)
+		// into assuming Restep is a difficulty name
+		// lil b was right
+		const fuckTheEastCoast = d.title.match(
+			/^\[\d+\] \[\d+\] (.+?)(?: \((Beginner|Easy|Normal|Hard)\))?$/u
+		);
+
+		const [_, parsedTitle, weirdDiff] = fuckTheEastCoast;
+
+		title = parsedTitle;
+
+		if (weirdDiff) {
+			difficulty = weirdDiff;
+		}
+	} else {
+		title = d.title;
+	}
+
+	const maybeUniqueSongID = `${d.artist}-nobodywillbreakthis-${title}-${d.subtitle}`;
+
+	if (ids[maybeUniqueSongID] === undefined) {
+		ids[maybeUniqueSongID] = freshID;
+
+		let subtitle = d.subtitle;
+		if (subtitle === "For Business") {
+			subtitle = `FB ${d.displayBPM[0]}`;
+		} else if (subtitle === "For Pleasure") {
+			subtitle = `FP ${d.displayBPM[0]}`;
+		}
+
+		songs.push({
+			id: freshID,
+			title,
+			artist: d.artist,
+			searchTerms: [],
+			altTitles: [],
+			data: {
+				subtitle,
+			},
+		});
+
+		freshID++;
+	}
+
+	if (defs[d.chartHash]) {
+		// already got smth for this chart hash
+		continue;
+	}
+
+	defs[d.chartHash] = true;
+
+	charts.push({
+		chartID: CreateChartID(),
+		rgcID: null,
+		songID: ids[maybeUniqueSongID],
+		level: d.level.toString(),
+		levelNum: d.level,
+		isPrimary: true,
+		difficulty,
+		playtype: "Single",
+		tierlistInfo: {},
+		versions: [],
+		data: {
+			chartHash: d.chartHash,
+			tech: d.tech,
+			breakdown: d.breakdown,
+			charter: d.charter,
+			displayBPM: d.displayBPM[0],
+			length: d.length,
+		},
+	});
+}
+
+if (options.append) {
+	MutateCollection("songs-itg.json", (oldSongs) => [...oldSongs, ...songs]);
+	MutateCollection("charts-itg.json", (oldCharts) => [...oldCharts, ...charts]);
+} else {
+	MutateCollection("songs-itg.json", () => songs);
+	MutateCollection("charts-itg.json", () => charts);
+}