At the apartment, Rikka tries to figure out with Yūta Togashi and Kuzuha Togashi as to why their pet cat Chimera has gained weight even after giving birth. They soon learn that Satone Shichimiya and Tōka Takanashi have each been secretly feeding Chimera behind their backs.
第二期BD/DVD各卷收录的未播放特典短动画。共7话。
非同好会，为探讨为什么Kimera(奇美拉 猫)瘦不下来的原因。
