Yoshii is sitting alone in his apartment, eating, when the doorbell suddenly rings. At the door is a very buxom young woman (she looks in her 20s, though I admit it is sometimes hard to tell in anime, where women older than teenagers but younger than gray-haired grandmothers are simply drawn in one stereotypical manner), wearing only a bathrobe. She turns out to be Akihisa's elder sister Akira, who has come back to Japan from studying abroad.
She has come back to see if Akihisa can handle living on his own and is providing himself with a healthy living environment, not only in terms cleanliness by also from a moral perspective, though Akira hardly seems qualified to judge anyone on that score: her idea of punishing Akihisa for falling short of remembering the agreement he made with his family to allow him to live alone is to threaten to sexually molest him.
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