After a long absence, Yuuichi Aizawa returns to his aunt Akiko's town following his parents' departure for Africa. Despite his memory loss about the place and its residents, including his cousin Nayuki, Yuuichi rediscovers fragments of his past while unpacking and finding a mysterious red headband. As he explores the snowy town, he unravels hidden secrets and connections to his forgotten history, realizing a supernatural undercurrent involving the women he encounters.