diff --git a/src/server/api/endpoints/admin/resync-chart.ts b/src/server/api/endpoints/admin/resync-chart.ts
new file mode 100644
index 000000000..7f4c5e03c
--- /dev/null
+++ b/src/server/api/endpoints/admin/resync-chart.ts
@@ -0,0 +1,21 @@
+import define from '../../define';
+import { driveChart, notesChart, usersChart, instanceChart } from '../../../../services/chart';
+import { insertModerationLog } from '../../../../services/insert-moderation-log';
+
+export const meta = {
+	tags: ['admin'],
+
+	requireCredential: true,
+	requireModerator: true,
+};
+
+export default define(meta, async (ps, me) => {
+	insertModerationLog(me, 'chartResync');
+
+	driveChart.resync();
+	notesChart.resync();
+	usersChart.resync();
+	instanceChart.resync();
+
+	// TODO: ユーザーごとのチャートもキューに入れて更新する
+});
diff --git a/src/services/chart/charts/classes/test.ts b/src/services/chart/charts/classes/test.ts
index 57c22822f..0ca63d174 100644
--- a/src/services/chart/charts/classes/test.ts
+++ b/src/services/chart/charts/classes/test.ts
@@ -6,7 +6,7 @@ import { name, schema } from '../schemas/test';
 type TestLog = SchemaType<typeof schema>;
 
 export default class TestChart extends Chart<TestLog> {
-	private total = 0;
+	public total = 0; // publicにするのはテストのため
 
 	constructor() {
 		super(name, schema);
diff --git a/src/services/chart/core.ts b/src/services/chart/core.ts
index 60ba1ebb4..9dc250f75 100644
--- a/src/services/chart/core.ts
+++ b/src/services/chart/core.ts
@@ -65,7 +65,7 @@ export default abstract class Chart<T extends Record<string, any>> {
 	public schema: Schema;
 	protected repository: Repository<Log>;
 	protected abstract genNewLog(latest: T): DeepPartial<T>;
-	protected abstract async fetchActual(group?: string): Promise<DeepPartial<T>>;
+	protected abstract async fetchActual(group: string | null): Promise<DeepPartial<T>>;
 
 	@autobind
 	private static convertSchemaToFlatColumnDefinitions(schema: Schema) {
@@ -341,6 +341,24 @@ export default abstract class Chart<T extends Record<string, any>> {
 		]);
 	}
 
+	@autobind
+	public async resync(group: string | null = null): Promise<any> {
+		const data = await this.fetchActual(group);
+
+		const update = async (log: Log) => {
+			await this.repository.createQueryBuilder()
+				.update()
+				.set(Chart.convertObjectToFlattenColumns(data))
+				.where('id = :id', { id: log.id })
+				.execute();
+		};
+
+		return Promise.all([
+			this.getCurrentLog('day', group).then(log => update(log)),
+			this.getCurrentLog('hour', group).then(log => update(log)),
+		]);
+	}
+
 	@autobind
 	protected async inc(inc: DeepPartial<T>, group: string | null = null): Promise<void> {
 		await this.commit(Chart.convertQuery(inc as any), group);
diff --git a/test/chart.ts b/test/chart.ts
index 28f34193f..bd26f3bf3 100644
--- a/test/chart.ts
+++ b/test/chart.ts
@@ -320,4 +320,60 @@ describe('Chart', () => {
 			});
 		}));
 	});
+
+	describe('Resync', () => {
+		it('Can resync', async(async () => {
+			testChart.total = 1;
+
+			await testChart.resync();
+
+			const chartHours = await testChart.getChart('hour', 3);
+			const chartDays = await testChart.getChart('day', 3);
+
+			assert.deepStrictEqual(chartHours, {
+				foo: {
+					dec: [0, 0, 0],
+					inc: [0, 0, 0],
+					total: [1, 0, 0]
+				},
+			});
+
+			assert.deepStrictEqual(chartDays, {
+				foo: {
+					dec: [0, 0, 0],
+					inc: [0, 0, 0],
+					total: [1, 0, 0]
+				},
+			});
+		}));
+
+		it('Can resync (2)', async(async () => {
+			await testChart.increment();
+
+			clock.tick('01:00:00');
+
+			testChart.total = 100;
+
+			await testChart.resync();
+
+			const chartHours = await testChart.getChart('hour', 3);
+			const chartDays = await testChart.getChart('day', 3);
+
+			assert.deepStrictEqual(chartHours, {
+				foo: {
+					dec: [0, 0, 0],
+					inc: [0, 1, 0],
+					total: [100, 1, 0]
+				},
+			});
+
+			assert.deepStrictEqual(chartDays, {
+				foo: {
+					dec: [0, 0, 0],
+					inc: [1, 0, 0],
+					total: [100, 0, 0]
+				},
+			});
+		}));
+	});
 });