"In order to pass his college entrance exams, high school senior Takahashi Misaki is stuck being tutored by his brother's ultra-famous writer friend Usami Akihiko. However, one day Misaki visits Usami's home and he's not there, and Misaki finds boys love novels featuring his brother as the protagonist! It turns out that Usami's side job is writing boys love novels for Marukawa Shoten's "Sapphire" boys love label. However, for the sake of Misaki's brother Shinobu's happiness, Usami has never told him his true feelings, which start to change as Usami spends more time with Misaki. After that, Shinobu is transferred for his work, and Misaki moves in to Usami's mansion. With Usami's work and that unusual home situation, Misaki suffers through his feelings and little by little comes to learn about love."