この△ラブコメは幸せになる義務がある。

（なんでレイラの本命にならなきゃいけないの？） 平凡な高校生の八代天馬は、同じクラスの冷徹な美少女・凛花が幼なじみの美少女・椿レイラに恋をしていることを偶然知ってしまう。( Why do you have to be the favorite of Reira? ) Tenma Yashiro, an ordinary high school student, accidentally discovers that a cool-headed beauty in the same class, Rinka, is in love with her childhood friend, Reira Tsubaki, a beautiful and innocent girl. Tenma then decides to help Rinka become friends with Reira. ( If Yashiro-kun is not dating Rinka, maybe I should run for her? ) ( Yashiro, what did you do? ) Then Reira falls in love with Tenma, and a love triangle develops between two of the school's most beautiful girls! What will happen to this complicated love triangle...?