Anta Nante Okotowari!

Yui is close to an older male relative, whom she affectionately calls "older brother," and is deeply upset when he marries. At the wedding, she encounters a crying boy named Kaoru, who is distraught because his cousin—whom he loved—is Yui's brother's new wife. Determined to move on, Yui transfers to a boys' dormitory to explore new relationships. There, she discovers that the dorm's head is Kaoru.