Ikumi Sakurai is a first year high school student who begins to investigate her dead mothers past.

A piano teacher struggles with the dark legacy of his family: he once witnessed his father beating a man to death. Fearing a genetic inclination for violence he struggles to stay sane when he is pulled down the dark path of an illegal firm that sells revenge for hire.

Masako, who had an ordinary marriage, suddenly finds herself struggling with her husband Kenji, who is afflicted with early-onset dementia. Torn apart by the sudden advances of Asai, a man who crosses the line, Masako begins to take an irregular approach: binding each other without touching each other.