Hiroki had sex with his childhood friend Meiko out of curiosity and escalated their body-only relationship. From the possessiveness that unconsciously swelled up he hurts Meiko, and the distance between the two grows. At that time he witnesses her walking home from school together with a male classmate... Blaming himself and half giving up, Hiroki still cannot leave it unresolved and decides to chase after Meiko who has gone out to the summer festival...