Ep. 2: Kiriya's Mishap and Atena's Awakening to Family Ties

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Kiriya falls through the floor while reading shoujo manga, asking to share Koushi's room because he resembles her brothers. When she attempts to wrestle him, he flees, leaving her flustered. Serene offers to repair the floor if Koushi becomes her servant; a half-asleep Koushi agrees, and she kisses him. The next morning, the floor is fixed, and Koushi recalls a strange dream. Atena worries about their rapid friendship. While shopping, Koushi praises her progress with men, but she realizes he said the same to others and flees. Koushi saves her by claiming she is his sister when they encounter two men. Atena finds this appealing and insists he call her "big sis." Her skirt falls, exposing her panties and causing her to fall into his face. Despite this, she decides to protect him from the others' immoral behavior, prompting the other girls to also desire the sister role.