Yuma, the younger sister, has grown into an adult with a body that seduces her brothers. They tempt the innocent younger sister, who knows nothing, and attack her one after another! A forbidden sexual encounter between brother and sister, both of the same blood, unfolds under the same roof! "Big brother, you know all about Yuma's good spots..." Her body is toyed with according to carnal desires, and she drowns in pleasure - a true brother-sister love!