Kyoko always thought of Daiki as just her childhood friend, but everything changed the day he couldn't hold back anymore. The two of them had known each other now going on 20 years, and despite all that time, Kyoko could never bring herself to think of him as anything more than a friend. While she herself was a bit of a nerd and not exactly popular with boys, she couldn't help but wonder why Daiki, who was well liked, was never interested in girls. That is, until one day, when she finds him jerking off to her…! He even has the nerve afterwards to accuse her of turning him on! She couldn't believe it; ten years of pent-up sexual frustration all aimed at her! This sudden transformation of Daiki's has completely shattered the illusion of their childhood bond.