Ep. 4: Nayu recluta modelos para la guía de ropa interior mientras Haruka supera su inseguridad.

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Inspired by Komachi's words, Nayu asks Yako and Haruka to be her underwear models at a meeting to explain how to choose proper underwear. Yako eagerly agrees to help Nayu, but Haruka, feeling insecure about her breasts, in unsure about being seen in her underwear. However, Nayu's cheerful attitude in the face of her terrible loss gives Haruka the courage to give modeling a try. The meeting is met with great enthusiasm, but when Tamaki Mizuno-sensei discovers Komachi fighting with some peeping toms, the situation gets out of hand.