Depending on an original work of Maruta. When heading back home from school in the usual train line, Miyu's breasts are groped by the train molester, there Shun, her classmate, appears and saves her. He walks her home and teases her in regards to the chikan groping her breasts, plus he also kisses her. Miyu runs on home. The reality is however that this train incident was all a cunning trap plotted by Shun. Back home Miyu regrets