A compilation of stories. In the main story, two friends who secretly love each other, but are clueless about the other's affection. To hide his feelings, Kagami tells Fukamachi that he's in love with his sister, instead. Fukamachi reluctantly decides to introduce his sister to Kagami. Kagami is faced with showing Fukamachi how he feels before he's forced to go out with a girl he doesn't love.