Mayumi Dojima gazes at the stars from the rooftop of Yubiwa Academy Middle School. She has been searching for a star that she saw in the night sky ten years ago. She meets a mysterious and beautiful boy named Manabu Sotoin who suddenly takes her to the headquarters of the Pretty Boy Detective Club, where she meets five pretty boys with unique personalities. She asks the Pretty Boy Detective Club to search for the lost star but...

On the day of the elections for student council president, Kinshiro Yokuya, Mayumi’s rival candidate and classmate, sits next to her. Before Mayumi’s speech, Kinshiro sets his last trap...! Will the Pretty Boy Detective Club be able to protect Yubiwa Academy?