Miya Tachibana presumes that her bothersome brother, Junichi, will always be unlucky in love and remain single. In an attempt to verify her friend's declaration that he is considerate and compassionate, she opts to spy on him during school. Through her secret observation, she discovers that Junichi is adored by numerous girls, leading to an erroneous conclusion that he is fond of men. Nonetheless, upon rejecting a boy's romantic overtures, Miya re-evaluates her view of Junichi. This recollection triggers her memory of a similar circumstance that occurred two years ago, prompting her to question her initial impression of him.