After their entire class was transported to another world, Yogiri Takatou and Tomochika Dannoura were abandoned when it was discovered they had failed to receive the Gift, a special power that the rest of their class inherited from a powerful Sage named Sion. What none of the others knew, however, was that Yogiri already had his own unique power — one that multiple world governments back home were keeping him under observation for: the power of Instant Death! With Yogiri’s abilities now exposed and being scrutinized by Sages and Swordmasters alike, this unlikely duo continues their adventure, determined to find a way back to Japan. The only lead they have to go on is to follow their former classmates’ trail and track down the formidable Sion in the hopes that she’ll be willing to negotiate. But even with the power of Instant Death on their side, the world around them seems intent on making the task as much of a hassle as possible!

With the majority of their class and the entire capital wiped out, Yogiri and Tomochika left behind the Kingdom of Manii in search of additional Philosopher’s Stones, the energy sources they were told to gather if they ever want to make it back home. Having received one stone from the Sage Sion, a second from Risley, and having taken a third from the self-styled War God Raiza, the pair next set their eyes on a new country in the east, following a lead on the potential location of another Sage. With the half-demons they were assisting now comfortably settled in the City of the War God, the two have left their previous companions behind to begin their journey home. But of course, nothing is ever simple. One after another, strange new people begin appearing in their path to block their progress, and some of their former companions may not yet be willing to let them go...

Awaking to absolute chaos and carnage while on a school trip, Yogiri Takatou discovers that everyone in his class has been transported to another world! He had somehow managed to sleep through the entire ordeal himself, missing out on the Gift — powers bestowed upon the others by a mysterious Sage who appeared to transport them. Even worse, he and another classmate were ruthlessly abandoned by their friends, left as bait to distract a nearby dragon. Although not terribly bothered by the thought of dying, he reluctantly decides to protect his lone companion. After all, a lowly Level 1000 monster doesn't stand a chance against his secret power to invoke Instant Death with a single thought! If he can stay awake long enough to bother using it, that is...

Though Yogiri and Tomochika successfully managed to make their way to the mysterious continent of Belm, their success has come with a few drawbacks. As their companions are scattered across the continent, the duo (and their ghostly advisor, Mokomoko) soon find themselves caught up in the extensive warfare between Belm’s four factions. Yogiri’s abilities mean that they are safe from direct harm, but the bizarre system of laws governing the continent have left them in a position where even traveling around seems all but impossible. Somehow, they must find a way to reunite with their lost companions, find the Sage governing Belm, and retrieve his Philosopher’s Stone, all while dealing with the escalating response from the natives to Yogiri’s defensive powers. And wait—how did they get onto this island floating in the sky anyway?

After retrieving a Philosopher’s Stone from the Sage Alice and collecting three more from Shigeto, Yogiri and his growing entourage finally make plans to put the events of Ent behind them and head for the continent in the East. Despite further setbacks, they manage to find a way off the island with the aid of the self-proclaimed goddess Hiruko. But it’s no easy task locating the next Sage on their list, and they discover that even getting into this new territory might be trickier than they first thought. Meanwhile, an ancient goddess awakens in the ruins of Ent’s capital and swears to take revenge on the world that dared to imprison her by exterminating all life, one person at a time.

Having dealt with the threat of rogue classmate Yuuki Tachibana, Yogiri and Tomochika find that things are only getting worse. Their previous adventures have drawn the attention of the Sage Lain, and it didn’t take long for her subordinates to track them to Hanabusa, where they had intended to reunite with the rest of their class. Between the Sage’s minions and the arrival of a new Aggressor, it seems their luxurious stay in the city is coming to an abrupt end. As the landscape around them is transformed into a post-apocalyptic nightmare, the two are forced to realize that reuniting with their class may be a lot more difficult than they had first imagined...

After waking up to absolute chaos and carnage while on a school trip, Yogiri Takatou discovers that everyone in his class has been transported to another world! He had somehow managed to sleep through the entire ordeal himself, missing out on the Gift — powers bestowed upon the others by a mysterious Sage who appeared to transport them. Even worse, he and another classmate were ruthlessly abandoned by their friends, left as bait to distract a nearby dragon. Although not terribly bothered by the thought of dying, he reluctantly decides to protect his lone companion. After all, a lowly Level 1000 monster doesn't stand a chance against his secret power to invoke Instant Death with a single thought! If he can stay awake long enough to bother using it, that is...

Yogiri and Tomochika have made it through the game of Cavern Quest and now approach the last boss, “Lasbo.” Much to their surprise, Lasbo’s true identity is not that of a monster, but the other parties who’ve undertaken the same quest alongside them. Much to Van’ssurprise, the seven Philosopher’s Stones—keys to last boss’s area—have multiplied into hundreds, throwing the game’s conclusion into utter chaos. As he attempts to salvage what remains of his game, the Great Sage himself appears to observe the grand finale with his own eyes. Yogiri and Tomochika were hoping to finish Cavern Quest quickly in order to return to the surface and resume their search for a way home, but now that the Great Sage is involved, that’s going to be far more complicated than they ever imagined.

Leaving their growing entourage behind, Yogiri and Tomochika set sail on a cruise ship for the eastern island nation of Ent. But as always seems to be the case, things don't go quite as planned, and after attacks from pirates and the rebirth of an ancient High Wizard, they find their ship sinking with no land in sight. With the help of a mysterious ancient-dragon-turned-young-boy named Kouryu, they manage to escape the damaged vessel and just make it to shore in time. But as they continue on their journey to the Empire of Ent in search of the Sage Yoshifumi and the Philosopher's Stone he possesses, they are met with new obstacles as the twin goddesses Malna and Rilna finally begin to take measures to deal with Yogiri...sort of.

With the vast majority of Luu’s powers restored and the UEG dead, Yogiri and Tomochika are on the verge of finally making it back home. However, in order to undo the damage wrought by the UEG’s rampage, the Great Sage resets the entire world to the moment Yogiri’s class was first summoned. While the people Yogiri killed remain dead, everyone else is brought back to life, including Sion, the Sage responsible for summoning his class in the first place. Having retained her memories of her previous encounter with Yogiri, she agrees to help him and Tomochika collect the Philosopher’s Stones once again. While things seem poised to go more smoothly this time with her assistance, it doesn’t take long for another Sage’s carelessness to throw the entire world into a brand new kind of chaos.