Miyuri Obara loses her voice after being bullied. She is unable to assert herself, nor does she have the courage to cut her wrists. Miyuri’s only friend is a silkworm she found in the mountains. Naming it “Tsumugi”, she takes good care of it. But one day, the bully Shimizu finds out about a silkworm, and throws it away. But then, a girl named “Tsumugi” transfers in to her school.