September 7, 2012
A girl named Yuzurina Houshou moves next door to Shougo and introduces herself as his little sister. After Yuzurina explains to him the situation, Shougo receives a call from his mother, Kanoko Mikadono, and tells him on bringing with him a female accomplice during the Mikadono Group party. While frolicking in the swimming pool, the girls close to Shougo learn of Yuzurina's sibling relationship with him, much to their disbelief. After Yuzurina agress to take a DNA test, the other girls argue on who will Shougo choose as his accomplice to the party. Later at his apartment, Konoe makes dinner for Shougo and later presents herself as his "dessert". While Shougo teases Konoe, a bewildered Yuzurina overhears them. Shougo then sees Konoe off to her place, and when she tells him to kiss her, a shocked Miyabi witnesses this. Afterwards, Shougo receives the result from the DNA test, confirming his sibling relationship with Yuzurina.