姉・オレ・妹～教師、同級生、後輩のカンケイ～

The protagonist Kousuke attends school while living with his 3 stepsisters.
The oldest sister is his homeroom teacher, the second sister is his classmate and the youngest sister attends the neighboring girls school.
Kousuke starts developing certain emotions towards his sisters...
Mixing in a childhood friend and a student council president, an exciting school life is about to begin.