Usual student Hiromasa Shun who is anywhere. Neighbors of such Shun, Childhood friend Shimazaki Yui is not an ordinary girl... It likes Shun and it is unbearable, moreover, it is convinced that Shun likes her and it is unbearable, it seems to ○ Shun just by talking with other girls for a little, it is a "Yandere girl"!

Every day, even if it escapes, it shadows him, it appeals for too heavy love...