Murata, a university student living alone, has both hands paralysed by a designated intractable illness and has to receive home care. The worker dispatched to him is Oshikawa: beautiful and extremely unfriendly. A week of live-in care begins. Murata's condition means that if he doesn't ejaculate once an hour, he's hit by severe headaches — and the side effects have left his hands useless, so he can't do it himself. Hearing the situation, Oshikawa nods flatly, face like an iron mask. “...It's the job. That's not a problem.” A perfectionist, she takes his erection in hand with the same cold look and starts stroking it precisely. Expressionless, without a shred of sweetness, purely as a professional assistance with ejaculation — or so it was supposed to be.