Shiina Mayu

Mayu is a childish girl in junior high school who refuses to go to school. Her one and only friend she could trust in life, a ferret named Myuu, dies around when she meets Kouhei and the other main characters. As soon as something bad happens, she starts yelling the ferret's name and crying uncontrollably. In order to help her grow up, Kouhei gets her mixed in with his class. Her favorite food is a teriyaki burger. She also likes things that are long like a ferret, and takes a fancy to Rumi's hair and even strange plush snakes.