Kokomi Shiina, a girl on the rhythmic gymnastics team, heads to school as usual, tired. During practice, she meets a girl named Chloe Lemaire. Chloe drops a picture as she's leaving and Kokomi knows it had to be important to her, so she goes around the school looking for her, but can't seem to find the girl in question...
Promise on harakiri!
Harakiri-Versprechen.
¡Para promesa hacer harakiri!
¡Para promesa hacer harakiri!
C’est promis, croix de voix ?
Facciamo la promessa dell'harakiri!
Vamos fazer harakiri!