Immortal Detective, Reidou Momiji

Amanai Haruma is a mystery lover in the Literature Club, a club teetering on the verge of disbandment. After showing the mysterious, beautiful transfer student Reidou Momiji around the school and the club, both look forward to a fresh start to their school life. But right then, a classmate is murdered in the gym. And so, Amanai and Reidou must take on the ultimate locked-room murder that shakes their school to its core...