diff --git a/public/src/js/parsetja.js b/public/src/js/parsetja.js
index 6979c81..767456f 100644
--- a/public/src/js/parsetja.js
+++ b/public/src/js/parsetja.js
@@ -25,6 +25,7 @@
 			"A": {name: "daiDon", txt: strings.note.daiDon},
 			"B": {name: "daiKa", txt: strings.note.daiKa}
 		}
+		this.noteTypes_ex = strings.ex_note;
 		this.courseTypes = {
 			"0": "easy",
 			"1": "normal",
@@ -148,7 +149,32 @@
 		var circles = []
 		var circleID = 0
 		var regexAZ = /[A-Z]/
-		
+		var isAllDon = (note_chain, start_pos) => { 
+			for (var i = start_pos; i < note_chain.length; ++i) { 
+				var note = note_chain[i];
+				if (note && note.type !== "don" && note.type !== "daiDon") { 
+					return false;
+				}
+			}
+			return true;
+		}
+		var checkChain = (note_chain, measure_length, is_last) => {
+			//console.log(note_chain, measure_length, is_last);
+			/*if (measure_length >= 24) {
+				for (var note of note_chain) {
+					note.text = this.noteTypes_ex[note.type][0];
+				}
+			} else { */
+				var alldon_pos = null;
+				for (var i = 0; i < note_chain.length - (is_last ? 1 : 0); ++i) {
+					var note = note_chain[i];
+					if (alldon_pos === null && is_last && isAllDon(note_chain, i)) { 
+						alldon_pos = i;
+					}
+					note.text = this.noteTypes_ex[note.type][alldon_pos != null ? (i - alldon_pos) % 2 : 0];
+				}
+			//}
+		}
 		var pushMeasure = () => {
 			var note = currentMeasure[0]
 			if(note){
@@ -183,9 +209,11 @@
 					var msPerMeasure = 60000 * measure / note.bpm
 					ms += msPerMeasure / currentMeasure.length
 				}
-				for(var i = 0; i < currentMeasure.length; i++){
+				var note_chain = [];
+				for (var i = 0; i < currentMeasure.length; i++){
+					//console.log(note_chain.length);
 					var note = currentMeasure[i]
-					if(note.type){
+					if (note.type) {
 						circleID++
 						var circleObj = new Circle({
 							id: circleID,
@@ -200,13 +228,30 @@
 							branch: currentBranch,
 							section: note.section
 						})
-						if(lastDrumroll === note){
+						if (note.type === "don" || note.type === "ka" || note.type === "daiDon" || note.type === "daiKa") {
+							note_chain.push(circleObj);
+						} else { 
+							if (note_chain.length > 1 && currentMeasure.length >= 8) { 
+								checkChain(note_chain, currentMeasure.length, false);
+							}
+							note_chain = [];
+						} 
+						if (lastDrumroll === note) {
 							lastDrumroll = circleObj
 						}
 						
 						circles.push(circleObj)
+					} else if (!(currentMeasure.length >= 24 && (!currentMeasure[i + 1] || currentMeasure[i + 1].type))
+						&& !(currentMeasure.length >= 48 && (!currentMeasure[i + 2] || currentMeasure[i + 2].type || !currentMeasure[i + 3] || currentMeasure[i + 3].type))) { 
+						if (note_chain.length > 1 && currentMeasure.length >= 8) { 
+							checkChain(note_chain, currentMeasure.length, true);
+						}
+						note_chain = [];
 					}
 				}
+				if (note_chain.length > 1 && currentMeasure.length >= 8) { 
+					checkChain(note_chain, currentMeasure.length, false);
+				}
 			}else{
 				var msPerMeasure = 60000 * measure / bpm
 				ms += msPerMeasure
diff --git a/public/src/js/strings.js b/public/src/js/strings.js
index 5bed612..40a4792 100644
--- a/public/src/js/strings.js
+++ b/public/src/js/strings.js
@@ -50,6 +50,22 @@
 		daiDrumroll: "連打(大)ーっ!!",
 		balloon: "ふうせん"
 	}
+	this.ex_note = {
+		don: [
+			"ド",
+			"コ"
+		],
+		ka: [
+			"カ"
+		],
+		daiDon: [
+			"ドン(大)",
+			"ドン(大)"
+		],
+		daiKa: [
+			"カッ(大)"
+		]
+	}
 	this.combo = "コンボ"
 	this.clear = "クリア"
 	this.good = "良"
@@ -194,6 +210,22 @@ function StringsEn(){
 		daiDrumroll: "DRUM ROLLー!!",
 		balloon: "Balloon"
 	}
+	this.ex_note = {
+		don: [
+			"Do",
+			"Do"
+		],
+		ka: [
+			"Ka"
+		],
+		daiDon: [
+			"DON",
+			"DON"
+		],
+		daiKa: [
+			"KA"
+		]
+	}
 	this.combo = "Combo"
 	this.clear = "Clear"
 	this.good = "GOOD"
@@ -338,6 +370,22 @@ function StringsCn(){
 		daiDrumroll: "连打(大)ー!!",
 		balloon: "气球"
 	}
+	this.ex_note = {
+		don: [
+			"咚",
+			"咚"
+		],
+		ka: [
+			"咔"
+		],
+		daiDon: [
+			"咚(大)",
+			"咚(大)"
+		],
+		daiKa: [
+			"咔(大)"
+		]
+	}
 	this.combo = "连段"
 	this.clear = "通关"
 	this.good = "良"
@@ -482,6 +530,22 @@ function StringsTw(){
 		daiDrumroll: "連打(大)ー!!",
 		balloon: "氣球"
 	}
+	this.ex_note = {
+		don: [
+			"咚",
+			"咚"
+		],
+		ka: [
+			"咔"
+		],
+		daiDon: [
+			"咚(大)",
+			"咚(大)"
+		],
+		daiKa: [
+			"咔(大)"
+		]
+	}
 	this.combo = "連段"
 	this.clear = "通關"
 	this.good = "良"
@@ -626,6 +690,22 @@ function StringsKo(){
 		daiDrumroll: "연타(대)ー!!",
 		balloon: "풍선"
 	}
+	this.ex_note = {
+		don: [
+			"쿠",
+			"쿠"
+		],
+		ka: [
+			"딱"
+		],
+		daiDon: [
+			"쿵(대)",
+			"쿵(대)"
+		],
+		daiKa: [
+			"딱(대)"
+		]
+	}
 	this.combo = "콤보"
 	this.clear = "클리어"
 	this.good = "얼쑤"