Seikatsu Majutsushi-tachi, Majo no Mori ni Idomu

In the Department of Everyday Magic, Rion, a witch apprentice, decides to participate in Walpurgis Night, while heading back to his master's house for a home visit, and take the exam to become a witch. However, with his classmates undergoing feminization, the appearance of a mysterious beautiful girl who interferes more and more... he can't concentrate at all!?