Kyoko and Miku are childhood friends attending the same high school. One day, Miku confesses to Kyoko that she loves her. Miku tells Kyoko that she doesn't have to respond right away, but she wants her to decide whether or not to have a serious relationship with they graduate. Until then, Kyoko can do or say whatever she wants to Miku. The story of Kyoko and Miku, a thrilling love experiment between two girls, begins...!