Kinoshita Megumi is a high school girl who lives with her man-crazed mother Yoshiko and her wheelchair-bound brother Taichi, who has a different father. One morning, Megumi bumps into a young man named Izumi as he comes out of Yoshiko's room. He attacks her, and she desperately runs out of the house. Megumi wanders the streets, and before she knows it, it's already dark outside...