It turned out springbreak ahead of the school entrance ceremony when Kaoru was informed from the principal that he'd earned a scholarship, but with a sexual condition: he'd to wear a revealing uniform and become a plaything for other students.
Bewildered Kaoru used his new uniform by visiting school during spring break, saw himself from the bathroom mirror, and thoughtlessly started jacking off, considering several futanari sisters,
Miyabi and Miaka, to fuel his fantasy.
If the sisters caught Kaoru during this process, he was pulled within their vortex.
The sadist sisters had humiliating plans to turn Kaoru inside their mesu pet.