feng, Sekai Project, Denpasoft - My Academy's Special Place Final (uncen-eng) - Adult Sex Game

Our hero's homeroom teacher is also his big sister, Yaeka. She's popular with the students, but at home, she's a slobbish drunk. There's Maika, an exchange student and Akiba nerd. She's always asking him to go to Akiba with her. But Maika is told to return home. Two love stories are about to begin!