While exploring the Weald, Yuuya Tenjou happens upon a mysterious cave. Inside, he finds a document penned by a legendary sage that he uses to inherit their mana pathways, gaining exceptional skills and all-powerful magic. Now there’s nothing that can stop Yuuya—not even the laws of nature!

Yuuya has always been a loser, and after the death of his grandpa (the only person he had in his corner), he’s sure there’s no point even trying anymore. But when Yuuya moves into his late gramps’s home, he inherits...a two-way door to another world?! Access to this new realm might be just the cheat Yuuya needs to succeed in his everyday life!

It’s time for the Ousei Academy camping trip! Yuuya and his classmates head into the wilderness, where they’ll need to build shelters, find food, and otherwise fend for themselves. Yuuya quickly steals the show (and several of his classmates’ hearts) after saving the day, thanks to his maxed-out survival skills! And back in the other world, the day Yuuya promised to meet Princess Lexia has arrived. But an ambush cuts their reunion short when Luna moves to complete her mission and assassinate the princess! As Yuuya recalls their time training together in the forest—and the bond they forged—will he be able to do what’s necessary to stop her...?

When the home left to Yuuya by his grandpa leads him to another world, Yuuya levels up in his own mundane reality! But despite his new otherworldly cheat, his life is still far from easy—his old bullies have an even bigger bone to pick with him while his new acquaintances from the elite Ousei Academy hold him to lofty expectations. Then, as Yuuya struggles with his new responsibilities, political schemes of the other realm threaten to throw his hard-earned peace into chaos…

As Yuuya’s skills in the other world improve, so too does his life in the real world. Starting fresh at Ousei Academy, he begins to shine at academics and sports, even making a few new friends. Has Yuuya finally found a place that really accepts who he is?

A Knight in Shining...Thunderbolt Armor?! After stopping an assassination attempt on King Arnold and Princess Lexia, Yuuya is roped into the hunt for the traitorous Prince Reigar. In the ensuing chaos, a mysterious girl attacks without warning. Her goal? Destroy the world! To have any chance of holding his own against this new foe who is on par with Master Rabbit, Yuuya will have to think fast—as fast as lightning. Hopefully, his quick thinking will be just as useful on Earth, because when Kaori visits his place to study for midterms, she accidentally stumbles upon the door to the other world!

A Chance to Come Back! A mysterious door stands open, inviting a boy who’s been brutally bullied all his life to take a courageous step forward into the unknown. On the other side, he finds a hoard of priceless artifacts and a world as filled with magic as it is with monsters. The most shocking revelation, however, is that he can bring whatever he wants back with him when he returns to Earth. It won’t be long before this double life changes him forever...