Ep. 4: Fumino’s Diet Misunderstanding, Rizu’s Psychology, and Uruka’s Bra Incident

Fumino gains weight from study group snacks and begins dieting, forcing Nariyuki to verify her figure despite his panic. He later discovers she overeats after school because she believes night studying burns more calories, allowing her weight to normalize. Meanwhile, Science Club President Sawako Sekijo confronts Rizu, convinced she studies psychology for Nariyuki. After Nariyuki asks embarrassing questions and Rizu shows no reaction, Sawako realizes her mistake and seeks friendship. In a separate incident, Uruka arrives at school without a bra and hides her chest during basketball, causing Nariyuki to worry about her health. She eventually falls into his face, but he remains unfazed because his sister Mizuki often goes braless at home. The episode concludes with Mizuki punishing Nariyuki for noticing she was actually wearing a bra.

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