Aika Tenkūbashi

The primary heroine of the series. She is childish, naive, and shy about talking to others. This distances her from them even though she wishes to be popular among her peers. Aika is strongly fascinated of the outside world. The PSP, ramen, and manga are but a few of her interests. She asks Kimito to teach her how to be a commoner. Aika declares the establishment of the Commoner Club with Kimito as the master. She seems to have feelings for Kimito beyond that of master and disciple.