"I wonder if it feels good to be tied up with ropes?" My best friend, Aoi, said that after seeing her parents' Shibari play. I couldn't stand it when my favorite girl said that... Kana approaches Aoi under the pretext of Shibari and attacks her, who can't move. It's no good for girls to do this, but it feels good...! Once you know the pleasure, you can't forget it, and the two's actions escalate. School swimsuit Shibari, massive squirting, penis ring irrumatio & sex training... As they indulge in SM sex, something changes in their relationship...? The secret immoral lesbianism of uniform girls!