Due to a training assignment, Aunt Yuko comes to Tokyo, and her nephew Takashi agrees to let her stay at his apartment for a few days. Takashi had expected her to be "older and aged by now," but the moment they reunite, his assumption is shattered. Yuko looks exactly the same as before—no, she's even more radiant and beautiful than ever. Takashi can't hide his shock. Spending four days alone together, he finds himself increasingly excited, thinking, "Such a gorgeous aunt..." Unintentionally, a special tension begins to build between them.