If Witch, Then Which? Series by Ato Sakurai

Ever since a lifesaving blood transfusion, Haruka Kuze has been indebted to Maruna Rinjou. The only problem: How do you show your gratitude to someone who barely gives you the time of day? So when he finds out she's actually a witch, Haruka swears he'll do whatever it takes to help her graduate from magic school-even if it means cross-dressing as a girl! But does Maruna really hate him, or is there another reason she gets so flustered when he's around?

Although Haruka’s cross-dressing may have been good enough to get him into the Eastern Woods of the Sacred Witch Academy, keeping it secret is another matter, with his everyday life turning into a dance with danger! But while he focuses on dodging clingy classmates and communal baths, others are starting to notice Maruna’s powers... moreAlthough Haruka’s cross-dressing may have been good enough to get him into the Eastern Woods of the Sacred Witch Academy, keeping it secret is another matter, with his everyday life turning into a dance with danger! But while he focuses on dodging clingy classmates and communal baths, others are starting to notice Maruna’s powers. As the moon rises on Walpurgis Night, Haruka and Maruna are approached by the academy’s most brilliant prodigy with a request to help her investigate a deeply personal mystery… less

At long last, Haruka’s cross-dressing has finally been exposed…! Faced with the possibility of expulsion and a mysterious threat assaulting the academy, what will become of him and Maruna…!?