diff --git a/.gitignore b/.gitignore
index a7b211e..6849230 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ config.json
 built
 node_modules
 memory.json
+font.ttf
diff --git a/README.md b/README.md
index 3109a9e..453881a 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,9 @@ Misskey用の日本語Botです。
 ```
 `npm install` して `npm run build` して `npm start` すれば起動できます
 
+## フォント
+一部の機能にはフォントが必要です。藍にはフォントは同梱されていないので、ご自身でフォントをインストールディレクトリに`font.ttf`という名前で設置してください。
+
 ## 記憶
 藍は記憶の保持にインメモリデータベースを使用しており、藍のインストールディレクトリに `memory.json` という名前で永続化されます。
 
diff --git a/src/index.ts b/src/index.ts
index 78d75b6..1b66e8d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -20,6 +20,7 @@ import ServerModule from './modules/server';
 import FollowModule from './modules/follow';
 import ValentineModule from './modules/valentine';
 import MazeModule from './modules/maze';
+import ChartModule from './modules/chart';
 
 import chalk from 'chalk';
 import * as request from 'request-promise-native';
@@ -71,6 +72,7 @@ promiseRetry(retry => {
 		new ValentineModule(),
 		new KeywordModule(),
 		new MazeModule(),
+		new ChartModule(),
 	]);
 }).catch(e => {
 	log(chalk.red('Failed to fetch the account'));
diff --git a/src/modules/chart/index.ts b/src/modules/chart/index.ts
new file mode 100644
index 0000000..2d0869a
--- /dev/null
+++ b/src/modules/chart/index.ts
@@ -0,0 +1,107 @@
+import autobind from 'autobind-decorator';
+import Module from '../../module';
+import serifs from '../../serifs';
+import Message from '../../message';
+import { renderChart } from './render-chart';
+
+export default class extends Module {
+	public readonly name = 'chart';
+
+	@autobind
+	public install() {
+		this.post();
+		setInterval(this.post, 1000 * 60 * 3);
+
+		return {
+			mentionHook: this.mentionHook
+		};
+	}
+
+	@autobind
+	private async post() {
+		const now = new Date();
+		if (now.getHours() !== 23) return;
+		const date = `${now.getFullYear()}-${now.getMonth()}-${now.getDate()}`;
+		const data = this.getData();
+		if (data.lastPosted == date) return;
+		data.lastPosted = date;
+		this.setData(data);
+
+		this.log('Time to chart');
+		const file = await this.genChart('notes');
+
+		this.log('Posting...');
+		this.ai.post({
+			text: serifs.chart.post,
+			fileIds: [file.id]
+		});
+	}
+
+	@autobind
+	private async genChart(type, params?): Promise<any> {
+		this.log('Chart data fetching...');
+
+		let chart;
+
+		if (type === 'userNotes') {
+			const data = await this.ai.api('charts/user/notes', {
+				span: 'day',
+				limit: 30,
+				userId: params.userId
+			});
+
+			chart = {
+				datasets: [{
+					data: data.diffs.normal
+				}, {
+					data: data.diffs.reply
+				}, {
+					data: data.diffs.renote
+				}]
+			};
+		} else if (type === 'notes') {
+			const data = await this.ai.api('charts/notes', {
+				span: 'day',
+				limit: 30,
+			});
+
+			chart = {
+				datasets: [{
+					data: data.local.diffs.normal
+				}, {
+					data: data.local.diffs.reply
+				}, {
+					data: data.local.diffs.renote
+				}]
+			};
+		}
+
+		this.log('Chart rendering...');
+		const img = renderChart(chart);
+
+		this.log('Image uploading...');
+		const file = await this.ai.upload(img, {
+			filename: 'chart.png',
+			contentType: 'image/png'
+		});
+
+		return file;
+	}
+
+	@autobind
+	private async mentionHook(msg: Message) {
+		if (msg.includes(['チャート'])) {
+			this.log('Chart requested');
+			const file = await this.genChart('userNotes', {
+				userId: msg.userId
+			});
+			this.log('Replying...');
+			msg.replyWithFile(serifs.chart.foryou, file);
+			return {
+				reaction: 'like'
+			};
+		} else {
+			return false;
+		}
+	}
+}
diff --git a/src/modules/chart/render-chart.ts b/src/modules/chart/render-chart.ts
new file mode 100644
index 0000000..c9d1b56
--- /dev/null
+++ b/src/modules/chart/render-chart.ts
@@ -0,0 +1,201 @@
+import { createCanvas, registerFont } from 'canvas';
+
+const width = 1024 + 256;
+const height = 512 + 256;
+const margin = 128;
+
+const chartAreaX = margin;
+const chartAreaY = margin;
+const chartAreaWidth = width - (margin * 2);
+const chartAreaHeight = height - (margin * 2);
+
+const lineWidth = 16;
+const yAxisThickness = 2;
+
+const colors = {
+	bg: '#434343',
+	text: '#e0e4cc',
+	yAxis: '#5a5a5a',
+	dataset: [
+		'#ff4e50',
+		'#c2f725',
+		'#69d2e7',
+		'#f38630',
+		'#f9d423',
+	]
+};
+
+const yAxisTicks = 4;
+
+type Chart = {
+	title?: string;
+	datasets: {
+		title?: string;
+		data: number[];
+	}[];
+};
+
+export function renderChart(chart: Chart) {
+	registerFont('./font.ttf', { family: 'CustomFont' });
+
+	const canvas = createCanvas(width, height);
+	const ctx = canvas.getContext('2d');
+	ctx.antialias = 'default';
+
+	ctx.fillStyle = colors.bg;
+	ctx.beginPath();
+	ctx.fillRect(0, 0, width, height);
+
+	const xAxisCount = chart.datasets[0].data.length;
+	const serieses = chart.datasets.length;
+
+	let lowerBound = Infinity;
+	let upperBound = -Infinity;
+
+	for (let xAxis = 0; xAxis < xAxisCount; xAxis++) {
+		let v = 0;
+		for (let series = 0; series < serieses; series++) {
+			v += chart.datasets[series].data[xAxis];
+		}
+		if (v > upperBound) upperBound = v;
+		if (v < lowerBound) lowerBound = v;
+	}
+
+	// Calculate Y axis scale
+	const yAxisSteps = niceScale(lowerBound, upperBound, yAxisTicks);
+	const yAxisStepsMin = yAxisSteps[0];
+	const yAxisStepsMax = yAxisSteps[yAxisSteps.length - 1];
+	const yAxisRange = yAxisStepsMax - yAxisStepsMin;
+
+	// Draw Y axis
+	ctx.lineWidth = yAxisThickness;
+	ctx.lineCap = 'round';
+	ctx.strokeStyle = colors.yAxis;
+	for (let i = 0; i < yAxisSteps.length; i++) {
+		const step = yAxisSteps[yAxisSteps.length - i - 1];
+		const y = i * (chartAreaHeight / (yAxisSteps.length - 1));
+		ctx.beginPath();
+		ctx.lineTo(chartAreaX, chartAreaY + y);
+		ctx.lineTo(chartAreaX + chartAreaWidth, chartAreaY + y);
+		ctx.stroke();
+
+		ctx.font = '20px CustomFont';
+		ctx.fillStyle = colors.text;
+		ctx.fillText(step.toString(), chartAreaX, chartAreaY + y - 8);
+	}
+
+	const newDatasets = [];
+
+	for (let series = 0; series < serieses; series++) {
+		newDatasets.push({
+			data: []
+		});
+	}
+
+	for (let xAxis = 0; xAxis < xAxisCount; xAxis++) {
+		for (let series = 0; series < serieses; series++) {
+			newDatasets[series].data.push(chart.datasets[series].data[xAxis] / yAxisRange);
+		}
+	}
+
+	const perXAxisWidth = chartAreaWidth / xAxisCount;
+
+	let newUpperBound = -Infinity;
+
+	for (let xAxis = 0; xAxis < xAxisCount; xAxis++) {
+		let v = 0;
+		for (let series = 0; series < serieses; series++) {
+			v += newDatasets[series].data[xAxis];
+		}
+		if (v > newUpperBound) newUpperBound = v;
+	}
+
+	// Draw X axis
+	ctx.lineWidth = lineWidth;
+	ctx.lineCap = 'round';
+
+	for (let xAxis = 0; xAxis < xAxisCount; xAxis++) {
+		const xAxisPerTypeHeights = [];
+
+		for (let series = 0; series < serieses; series++) {
+			const v = newDatasets[series].data[xAxis];
+			const vHeight = (v / newUpperBound) * (chartAreaHeight - ((yAxisStepsMax - upperBound) / yAxisStepsMax * chartAreaHeight));
+			xAxisPerTypeHeights.push(vHeight);
+		}
+
+		for (let series = serieses - 1; series >= 0; series--) {
+			ctx.strokeStyle = colors.dataset[series % colors.dataset.length];
+
+			let total = 0;
+			for (let i = 0; i < series; i++) {
+				total += xAxisPerTypeHeights[i];
+			}
+
+			const height = xAxisPerTypeHeights[series];
+
+			const x = chartAreaX + (perXAxisWidth * ((xAxisCount - 1) - xAxis)) + (perXAxisWidth / 2);
+
+			const yTop = (chartAreaY + chartAreaHeight) - (total + height);
+			const yBottom = (chartAreaY + chartAreaHeight) - (total);
+
+			ctx.globalAlpha = 1 - (xAxis / xAxisCount);
+			ctx.beginPath();
+			ctx.lineTo(x, yTop);
+			ctx.lineTo(x, yBottom);
+			ctx.stroke();
+		}
+	}
+
+	return canvas.toBuffer();
+}
+
+// https://stackoverflow.com/questions/326679/choosing-an-attractive-linear-scale-for-a-graphs-y-axis
+// https://github.com/apexcharts/apexcharts.js/blob/master/src/modules/Scales.js
+// This routine creates the Y axis values for a graph.
+function niceScale(lowerBound: number, upperBound: number, ticks: number): number[] {
+	// Calculate Min amd Max graphical labels and graph
+	// increments.  The number of ticks defaults to
+	// 10 which is the SUGGESTED value.  Any tick value
+	// entered is used as a suggested value which is
+	// adjusted to be a 'pretty' value.
+	//
+	// Output will be an array of the Y axis values that
+	// encompass the Y values.
+	const steps = [];
+
+	// Determine Range
+	const range = upperBound - lowerBound;
+
+	let tiks = ticks + 1;
+	// Adjust ticks if needed
+	if (tiks < 2) {
+		tiks = 2;
+	} else if (tiks > 2) {
+		tiks -= 2;
+	}
+
+	// Get raw step value
+	const tempStep = range / tiks;
+
+	// Calculate pretty step value
+	const mag = Math.floor(Math.log10(tempStep));
+	const magPow = Math.pow(10, mag);
+	const magMsd = (parseInt as any)(tempStep / magPow);
+	const stepSize = magMsd * magPow;
+
+	// build Y label array.
+	// Lower and upper bounds calculations
+	const lb = stepSize * Math.floor(lowerBound / stepSize);
+	const ub = stepSize * Math.ceil(upperBound / stepSize);
+	// Build array
+	let val = lb;
+	while (1) {
+		steps.push(val);
+		val += stepSize;
+		if (val > ub) {
+			break;
+		}
+	}
+
+	return steps;
+}
diff --git a/src/serifs.ts b/src/serifs.ts
index b430724..b0c083e 100644
--- a/src/serifs.ts
+++ b/src/serifs.ts
@@ -316,6 +316,11 @@ export default {
 		post: '今日の迷路です！ #AiMaze',
 		foryou: '描きました！'
 	},
+
+	chart: {
+		post: 'インスタンスの投稿数です！',
+		foryou: '描きました！'
+	},
 };
 
 export function getSerif(variant: string | string[]): string {
diff --git a/torisetu.md b/torisetu.md
index 5f7d2c6..e09e06f 100644
--- a/torisetu.md
+++ b/torisetu.md
@@ -59,6 +59,9 @@ Misskeyにアカウントを作成して初めて投稿を行うと、藍がそ
 ### バレンタイン
 藍がチョコレートをくれます。
 
+### チャート
+インスタンスの投稿チャートなどを投稿してくれます。
+
 ### サーバー監視
 サーバーの状態を監視し、負荷が高くなっているときは教えてくれます。