In a clandestine BDSM den, uniformed teachers and students kneel before their dominatrix, water element miko Hina (Hina Suguta) among them. Bondage ropes cinch their mammaries, accentuating their milky mounds. Blindfolded, they submit to floggers and clamps, their cries echoing in the dungeon. As the symphony of pain and pleasure crescendos, they're made to suckle each other's breasts, milk cascading down. The grand finale: their dominant teacher (Mao Kurata) fucks them, one by one, filling them with her cream.