High school girl Ritsu has been in love with her childhood friend Ichika but has kept her feelings to herself. However, when another childhood friend, Shun, confesses his feelings to Ichika, their relationship shifts into a love triangle. "I like Ichika too," Ritsu thinks, caught in a love that cannot be fulfilled between girls and an unattainable boyfriend. Left behind, Ritsu's feelings gradually overflow, stripping her of her common sense.