Ookuma Yuugo

Kishimine Kengo a boy, moved into a high school that was an all girl’s school until several years ago. In spite of the so called harem environment where he was surrounded only by girls, he wasn’t good at socialising and his sole hobby was immersing himself in reading. He lived a quiet life. But, he decided to participate in club activities that he hadn’t done until now and so his high school life changed into something stormy and full of drama. He joined the one where he played modern games – in short, the game club. Kishimine was supported by the beautiful student council head and a perverted teacher and he displayed unexpected talent. Now the curtain has been raised on the exciting gaming life of an ordinary boy. adapted from the light novel series of the same name

This prequel follows Kuro Hazama in the late 1960's-early 1970's before he became known as the surgeon "Black Jack."