Tokyo. Ryo Katou, 2nd grade school, really likes a girl of his school. Both takes the same train in the morning. He would like to find the courage to start a chat, but... without any success. Maybe his friend Mizuki Nakamura can do something about? She is kinda unusual girl. Katou's mother is a famous stylist and keep traveling around the world, so he lives with his sister, who have a particular relationship with.