Boku to Kimi no Nijuu Tantei

Reo, commonly known as "Boku-chan," is a weak and solitary second-year high school student. Sitting next to him is a girl student named Miki Kimino, who just sleeps. One day, his classmate Himekawa goes missing. Kimino, who was interested in this case, goes to the art room with Reo and aims to find out the truth of the case-!?