Munetaka Takesaka fails miserably during his first intimate night with his girlfriend due to deep-seated trauma from the past. Devastated and withdrawn, he confides in his stunning older sister Ritsuka, who boldly offers to cure him through very physical "lessons." Her cousin Mashiro soon joins in with equal enthusiasm, using her voluptuous body to rebuild his confidence.

However, things escalate when Wakana — the very sister responsible for his original trauma — returns from overseas and throws herself into the mix. What began as therapeutic training spirals into an all-out battle among these gorgeous, busty older sisters, each determined to "milk" Munetaka completely and claim him as their own.

Packed with massive dynamite breasts, passionate incestuous encounters, and non-stop erotic action, this OVA adaptation of the hit Atelier Kaguya game delivers the ultimate big-sister harem fantasy under the direction of Takashi Nishikawa, featuring the original game cast. Pure fanservice for lovers of onee-san and paizuri content.

Based on the erotic game by Atelier Kaguya Bare & Bunny.