"When I'm an adult, I'll definitely be back. So, wait for me in this house, okay?"

The novelist Tatsumi finds a boy in his garden one day. Despite not being good to children in general, Subaru was innocent and like a puppy, and Tatsumi became accustomed to the proximity of Subaru as they spent time together. But is not Subaru coming home? Until the puppy becomes a big dog ... An extremely sweet love between an innocent child and a twisted adult.