diff --git a/src/problems/problemData.ts b/src/problems/problemData.ts
index 7b1200c7..9cb8f112 100644
--- a/src/problems/problemData.ts
+++ b/src/problems/problemData.ts
@@ -2914,71 +2914,71 @@ class MyTurtle {
   // ----------- 初級プログラミングⅡ 第1回 ここから -----------
   multiObject1: {
     instrumented: `
-const t1 = new Turtle(1, 1); //trace
-const t2 = new Turtle(3, 3); //trace
-t1.forward();
-t1.turnRight();
-t2.forward();
-t2.turnLeft();
+const t1 = new Turtle(1, 1); // step
+const t2 = new Turtle(3, 3); // step
+t1.前に進む(); // step
+t1.右を向く(); // step
+t2.前に進む(); // step
+t2.左を向く(); // step
 `.trim(),
     java: `
 public class Main {
   public static void main(String[] args) {
-    Turtle t1 = new Turtle(1, 1); //sid
-    Turtle t2 = new Turtle(3, 3); //sid
-    t1.前に進む(); //sid
-    t1.右を向く(); //sid
-    t2.前に進む(); //sid
-    t2.左を向く(); //sid
+    Turtle t1 = new Turtle(1, 1); // step
+    Turtle t2 = new Turtle(3, 3); // step
+    t1.前に進む(); // step
+    t1.右を向く(); // step
+    t2.前に進む(); // step
+    t2.左を向く(); // step
   }
 }
 `.trim(),
   },
   multiObject2: {
     instrumented: `
-const t1 = new Turtle(1, 1); //trace
-t1.forward();
-t1.turnRight();
-const t2 = new Turtle(3, 3); //trace
-t2.forward();
-t2.turnLeft();
-t2.forward();
+const t1 = new Turtle(1, 1); // step
+t1.前に進む(); // step
+t1.右を向く(); // step
+const t2 = new Turtle(3, 3); // step
+t2.前に進む(); // step
+t2.左を向く(); // step
+t2.前に進む(); // step
 `.trim(),
     java: `
 public class Main {
   public static void main(String[] args) {
-    Turtle t1 = new Turtle(1, 1); //sid
-    t1.前に進む(); //sid
-    t1.右を向く(); //sid
-    Turtle t2 = new Turtle(3, 3); //sid
-    t2.前に進む(); //sid
-    t2.左を向く(); //sid
-    t2.前に進む(); //sid
+    Turtle t1 = new Turtle(1, 1); // step
+    t1.前に進む(); // step
+    t1.右を向く(); // step
+    Turtle t2 = new Turtle(3, 3); // step
+    t2.前に進む(); // step
+    t2.左を向く(); // step
+    t2.前に進む(); // step
   }
 }
 `.trim(),
   },
   garbageCollection1: {
     instrumented: `
-let t1 = new Turtle(1, 1); // trace
-t1.forward();
-t1.turnRight();
-let t2 = new Turtle(3, 3); // trace
-t2.forward();
-t2.remove();
+let t1 = new Turtle(1, 1); // step
+t1.前に進む(); // step
+t1.右を向く(); // step
+let t2 = new Turtle(3, 3); // step
+t2.前に進む(); // step
+t2.remove(); // step
 t2 = t1;
-t2.forward();
+t2.前に進む(); // step
 `.trim(),
     java: `
 public class Main {
   public static void main(String[] args) {
-    Turtle t1 = new Turtle(1, 1); // sid
-    t1.前に進む(); // sid
-    t1.右を向く(); // sid
-    Turtle t2 = new Turtle(3, 3); // sid
-    t2.前に進む(); // sid
-    t2 = t1; // sid
-    t2.前に進む(); // sid
+    Turtle t1 = new Turtle(1, 1); // step
+    t1.前に進む(); // step
+    t1.右を向く(); // step
+    Turtle t2 = new Turtle(3, 3); // step
+    t2.前に進む(); // step
+    t2 = t1; // step
+    t2.前に進む(); // step
   }
 }
 `.trim(),
diff --git a/src/problems/traceProgram.ts b/src/problems/traceProgram.ts
index 8f0b9ac6..1c818989 100644
--- a/src/problems/traceProgram.ts
+++ b/src/problems/traceProgram.ts
@@ -122,7 +122,7 @@ class Turtle {
     board[this.y][this.x] = this.color;
     turtles.push(this);
   }
-  forward(sid, self) {
+  前に進む() {
     const index = dirs.indexOf(this.dir);
     this.x += dx[index];
     this.y += dy[index];
@@ -130,9 +130,12 @@ class Turtle {
       throw new Error(\`Out of bounds: (\${this.x}, \${this.y})\`);
     }
     board[this.y][this.x] = this.color;
+  }
+  forward(sid, self) {
+    this.前に進む();
     addTrace(sid, self);
   }
-  backward(sid, self) {
+  後に戻る() {
     const index = dirs.indexOf(this.dir);
     this.x -= dx[index];
     this.y -= dy[index];
@@ -140,6 +143,9 @@ class Turtle {
       throw new Error(\`Out of bounds: (\${this.x}, \${this.y})\`);
     }
     board[this.y][this.x] = this.color;
+  }
+  backward(sid, self) {
+    this.後に戻る();
     addTrace(sid, self);
   }
   canMoveForward() {
@@ -148,16 +154,21 @@ class Turtle {
     const ny = this.y + dy[index];
     return nx >= 0 && nx < ${GRID_COLUMNS} && ny >= 0 && ny < ${GRID_ROWS};
   }
-  remove(sid, self) {
+  remove() {
     turtles.splice(turtles.indexOf(this), 1);
-    addTrace(sid, self);
   }
-  turnRight(sid, self) {
+  右を向く() {
     this.dir = dirs[(dirs.indexOf(this.dir) + 1) % 4];
+  }
+  turnRight(sid, self) {
+    this.右を向く();
     addTrace(sid, self);
   }
-  turnLeft(sid, self) {
+  左を向く() {
     this.dir = dirs[(dirs.indexOf(this.dir) + 3) % 4];
+  }
+  turnLeft(sid, self) {
+    this.左を向く();
     addTrace(sid, self);
   }
 }
@@ -222,7 +233,7 @@ ${modifiedCode.trim()}
   let lastCallerId = 0;
   for (const [index, line] of lines.entries()) {
     const refinedLine = line
-      .replace(/\s*\/\/\s*sid\s*(:\s*\d+|)\s*/, (_, sid) => {
+      .replace(/\s*\/\/\s*(?:sid|step)\s*(:\s*\d+|)\s*/, (_, sid) => {
         if (sid) {
           lastSid = Number(sid.slice(1));
         } else {
@@ -268,7 +279,7 @@ function modifyCode(instrumented: string): string[] {
           return `${newOrMethod}(${statementId}, this${delimiter}${args})${tail}`;
         }
       )
-      .replace(/\s*\/\/\s*trace\s*/, (_) => {
+      .replace(/\s*\/\/\s*(?:trace|step)\s*/, (_) => {
         statementReplaced = true;
         return `addTrace(${statementId}, this);`;
       })