In Episode 4 of "Tsundero," the narrative centers on Daisuke and his childhood friend, Saaya, who harbors insecurities about her large breasts and prominent nipples. Despite her self-consciousness, Saaya becomes aroused by Daisuke's gaze, leading to intimate encounters where they explore their feelings for each other. The episode delves into themes of body image and mutual attraction, contributing to the series' mature narrative.