Momma Oyama is on the scene! Former shut-in Mahiro Oyama was turned into a junior high school girl after being drugged by his little sister. But just as he begins to enjoy his peaceful junior high life, his mother comes home from a business trip, and he's suddenly in danger of being found out! Miyo-chan makes a new friend, a New Year's visit to the Nayuta household brings everyone together, and Kaede takes her college entrance exam-all of them continuing to grow, one step at a time, in volume 9!