Chizuru-chan Kaihatsu Nikki – Episode 6 (EN)

In the climactic Chizuru-chan Kaihatsu Nikki #6, post-coital from Tamura's relentless demands during the school trip, Shiina Chizuru is dragged straight into the men's open-air bath. There, they encounter another pair: Chisato Mashiro (aka Chii-chan) and her perverted uncle, who has similarly conditioned her into eager submission. Recognizing the coincidental "Chii" and "Chizuru" parallels, Tamura boldly proposes a girl swap to share their "developed" toys. The uncle eagerly agrees, leading to an intense group session where the men exchange partners.

Chizuru, now fully broken and craving depravity, services the uncle with the same enthusiasm she once reserved for protecting her crush. Meanwhile, Chii-chan—pierced, anal-trained, and utterly devoted—welcomes Tamura's rough advances, including deep anal penetration. The mixed bath becomes a steamy arena of swapping, double blowjobs, creampies, and mutual humiliation as the girls perform side-by-side, their bodies on full display in this forbidden crossover.

Lune Pictures delivers high-energy animation with detailed group dynamics, contrasting body reactions, ahegao overload, and the thrill of partner exchange. A perfect bonus episode for fans of ugly bastard swaps, 4P orgies, anal focus, exhibitionism in onsen, full corruption crossovers, big breasts, blowjobs, creampie, and the ultimate mind-break shared fantasy from the Kaihatsu Nikki universe.