Seiji is a tough but lonely teenager who suddenly finds that a teenage girl, Midori, has a crush on him and has turned into his right hand, complicating his school life and his relationships with friends.

Have you ever lost anything that was so precious to you, that if it were gone you wouldn't know what to do? For Otokawa Natsuru, that item is a keychain. Hearing from Kazama Miori, a fellow student with...