Ao is a gloomy and introverted high school boy who hates himself and has no friends... What brings Ao joy is watching "Magical☆Rhythm", a children anime. Naru, the most popular boy in his class, approaches Ao when he sees his Magical☆Rhythm keychain.
Ao becomes attached to Naru, his first "friend", someone who shares his interests and is also kind and gentle.
As things progress Naru starts to have a twisted affection towards Ao...
Regardless how painful, difficult, disgusting or wrong the extension of friendship may be, "Even so, we're still friends, right?"