Konatsu Amano is a high school girl who has just moved to a seaside town in Ehime Prefecture after her father is transferred overseas for his job. Lonely and unsure of her new surroundings, Konatsu finds herself gravitating towards Koyuki Honami, an older girl at her school who is popular but is seen as out of reach by her peers who view her as too perfect. Koyuki is also the sole member of the Aquarium Club, which in turn makes her feel cut off from others. In an attempt to help ease Koyuki and her own feelings of loneliness, Konatsu befriends Koyuki and the two gradually grow closer together.