C824 Restrain Restrain

Could it be...

The corner of the homeroom teacher's mouth twitched twice. With a straight face, he knocked on the door with a righteous look on his face.

When the butler saw that he had returned, he thought that he had forgotten to take something. In the end, the teacher-in-charge had a stern expression on his face. The butler was so frightened that he hurriedly opened the door.

"Teacher