A BDSM training documentary revealing the twisted desires of natural-born masochist Kuroki Ikumi, who experiences pleasure through intense pain during SM play, weeping yet craving even greater suffering. Driven by her own desires, she offers herself to the maniac, as her deep impulses and pursuit of the extreme are depicted with raw, documentary-like realism. This film exposes her innermost dependency, ecstasy, and the unknown boundaries beyond.