One day, Shio arrives home to find that her mother has gotten remarried and is going on a business trip with her new husband, leaving Shio with her new stepsister Kafka. Being only a day older than Kafka, Shio is concerned that Kafka will try to take the big sister position from her. Kafka, on the other hand, is determined to make Shio, who was her first love, fall for her.
When I returned home for the first time in a long time, my brother transformed into a girl!?
\"Big Sis!?\" \"Kouta!?\" The two of them were enjoying an in-game romance (without knowing each other\'s identities). Upon seeing each other\'s faces at their long-awaited offline meetup... they were both shocked to see that their partner was in fact their own sibling!? These are complicated feelings for sure... and rather hard to accept! (Source: [BookLive](https://booklive.jp/product/index/title_id/20068503/vol_no/001))
Haruto, currently financially unstable, not in education, or in employment, is begging for rent money from a woman. When his negotiation plans go awry, the person who suddenly appears is none other than Haruto\'s brother, Asahi...! He had always acted as the \"perfect brother\" in front of his family, so Haruto is unable to confide to anyone in his family about his current ruined state, and desperately tries to cover up the situation. However, Asahi forces Haruto to bring him to his place, and he discovers Haruto\'s current state...?! 【An obsessed-type cool little brother x Former perfect older brother】 The love between brothers who frustratingly misunderstand each other unfolds! What is the truth behind the \"complexes\" that each of them harbors...?
