I'm Standing on a Million Lives. 4

Yusuke Yotsuya doesn't care about getting into high school. He just wants to get back home to his game and away from other people. But when he suddenly finds himself in a real-life fantasy game alongside his two gorgeous classmates, he discovers a new world of possibility and excitement. Despite a rough start, Yusuke and his friend fight to level up and clear the challenges set before them by a mysterious figure from the future, but before long, they find that they're not just battling for their own lives, but for the lives of millions!