The story takes us back to the era of the samurai, as well as the confrontations between the various clans, these elite warriors. Shizume is a young kunoichi entrusted by her father to recover a stolen scroll (apparently containing the secrets of their clan). But the girl fails the mission and has to face the punishment her father has prepared for her. And the lashing is just "the tip of the iceberg." Well, to prevent the eldest child, the son, from failing on samurai missions, he invites him to take part in the "punishment" of his little sister...