Maru lives with her father, who works in a factory, and her sickly mother, Azusa. Wanting her mother to get well soon, Maru supported her mother bravely, but her father continued to violate Maru secretly. One day, Azusa's doctor, Nimaru Sasaki, who came to visit her, was threatened with having witnessed an act with her father and was raped. MARU cannot confide the truth to her mother and is just frightened. However, when Sasaki shows such a fearless smile, he approaches his mother who knows nothing about it.
