Natsumi's (Hikaru Takahashi) younger sister Haru passes away because a disease. She was just 19. Natsumi loved her younger sister a lot. Meanwhile, Haru was engaged to Togo. Togo comes from a distinguished family, who runs a large company. His parents care about pedigree a lot and suggests to Natsumi that she should now date Togo. Natsumi turns down their request, but Toho accepts his parents request to date Natsumi. Suddenly, Natsumi asks Togo to take her to places where he took her younger sister. Togo is surprised by her request, but he begins to take Natsumi around. Natsumi soon becomes attracted to Togo, but she feels a sense of guilt for her feelings.

Miyoshi Hayashi is one quirky high-school student who enjoys doing fun things that don't always quite make sense. Despite being hard to pin down, his mysterious charm never fails to draw others to him. In order to finance his activities, he sometimes helps out at his parents' restaurant, allowing him to continue living by his motto, "It's comfortable to have enough free time to waste."