During his Keio University entrance exam preparation, Touma Inaba's routine is disrupted by the unexpected arrival of his long-lost cousin, Urara Kasuga. As they reconnect, Urara's hidden romantic feelings for Touma surface, leading her to offer him a place to stay. Touma's encounter with the alluring Meiko Yotsuba adds another layer of complexity to his life, especially when Meiko successfully enters Keio while Touma fails due to a cold gifted by Urara. Faking his acceptance to Keio to impress Meiko, Touma finds himself entangled in a delicate love triangle, juggling his facade with the truth and his growing affection for both Urara and Meiko.