Oniichan Wa Oshimai! 7 [Special Edition]

The series has sold over 1 million copies! (Including e-books) Mahiro Oyama is a former recluse who has accidentally turned into a junior high school girl. He enjoys his second summer vacation in his second year of junior high school and fully enjoys school events such as the culture and sports festivals. He finds friends, a gal in his class whom he had been reluctant to get close to, and a different side to his gentle homeroom teacher, making his ordinary life more and more interesting and lively. His youth is smooth sailing today, too!