Yuuya Tenjou has been bullied all his life. Then he discovers a door to another world. Powerful weapons. Vicious monsters. It all seems like a fantasy game! And when he returns to his world, he realizes that his leveling up comes with him.

When Yuuya reunites with the girl he saved back at the convenience store, she invites him to attend the prestigious Ousei Academy. Yuuya isn’t sure that he’s worthy of attending a school full of geniuses, but he’s persuaded to try it for just one day.

Yuuya realizes that he doesn’t have many clothes that fit his new, leveled-up height. So, he heads to the mall where, in an unexpected turn of events, he ends up participating in a fashion photoshoot opposite a super popular female model?!

Yuuya has been reunited with the first person he met in the other world, a young woman named Lexia who is full of surprises. Back in his original world, Yuuya begins attending Ousei Academy, but his life doesn’t stay quiet for long.

As Yuuya tries to find a way to level up in the Darkest Regions, he comes across a Black Fenrir pup. Yuuya Tames him, names him Night, and brings him home to live together as family. Side by side, they explore the Darkest Regions...and also go for walks.

Yuuya has found The Book of the Sage. As he reads it, he realizes that it’s even more amazing than it seems. Meanwhile, the class’s study trip draws near. Yuuya is at the department store with his friends to buy supplies when trouble suddenly strikes.