Toba Setsuna

Yuuto's classmate who always stalks him for unknown reason. Despite being a stalker, she casually approaches Yuuto or joins the conversation with everyone just to make fun of him whenever she wants to and Yuuto himself doesn't seem to mind it. She is extremely good at game and very smart that she is always top rank at school. Because she follows Yuuto all the times, Hio sees her as rival in everything.