Hana to Otome ni Shukufuku o: Harukaze no Okurimono Portable

Tsukioka Akira, the protagonist, is a regular guy going about his everyday life, except for one thing. His twin sister is ill and in the hospital and cannot attend school. The problem is that she has been unwell for far too long, and she may have to repeat the year or drop out. So their parents, being the most astute people in the world, sent him, the spitting image of his sister, over to the prestigious all-girls school to go undercover as his sister and live her life for a while so that when she returned, she could take his place without dropping out or repeating. Of course, it’s a ridiculous concept, and he protested, but he gave in since he’s easily carried away. So begins his extraordinary life in an all-girls school.