Маруме Чіґума

He possesses outstanding athletic ability and a talent for music. With his quiet, mysterious charm, he is a heartthrob among the female students.

...However, he is actually a closet otaku who loves anime and games. He is incredibly uncomfortable around girls his own age—to the point where he can barely hold a conversation with them. Only the Archaeology Club members and a select few classmates know this side of him.

He joins the Archaeology Club after being scouted by Washio. The club's activities seem to suit him well; he is particularly fond of the painstaking, steady work involved and tackles it with great enthusiasm.