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...

Having finally made it out of the tower, Yogiri and Tomochika are greeted with an apocalyptic scene—or at least, it would have been, if not for Yogiri accidentally killing the Dark God who’d been trapped there. Despite the flawless execution of the goddess Vahanato’s plans, they amounted to nothing more than releasing her lover’s corpse from its imprisonment. After a quick visit from the Hedgehog and brief encounter with the Dark God’s surviving spawn, Yogiri and Tomochika are finally able to resume their journey to the capital. Meanwhile, with the disappearance of yet another Sage, Sion is finally beginning to realize just how much of a threat Yogiri is to their world.

Having overcome countless trials (without much difficulty), Yogiri and Tomochika finally managed to reunite with their classmates in the capital. But between the efforts of Ayaka, a synthetic classmate who swore revenge against her fellow students, the meddling of Sion, a Sage determined to cull the weak and produce a new superbeing from their class of candidates, and the revival of the Dark God Mana, the majority of the class — not to mention the entire capital — were ultimately wiped out. Somehow, amid the chaos, the unlikely pair were able to draw Sion out and acquire their first concrete clue about how to get home: they will need a number of Philosopher’s Stones, powerful artifacts carried within the bodies of the Sages. After taking one from Sion and finding another dropped into their laps by Risley, the only surviving clone of the Sage Lain, who they killed some time earlier, the two highschoolers set off in search of a third energy source, leaving a trail of ruins behind them.

Transported to another world and abandoned by their friends as bait for a nearby dragon, Yogiri Takatou and Tomochika Dannoura manage to survive thanks to Yogiri’s power to invoke Instant Death at will. Despite having been abandoned by them, the pair decide that their best option for making it in this world is to reunite with their classmates, and they set off after them. After a few close encounters in the city of Quenza and on the train taking them onwards, the two manage to reach the city of Hanabusa, a place that seems to mirror modern Japan. They decide to wait there for the rest of their class to catch up but come across a rogue classmate who has already reached level 10,000 and seems dangerously close to world domination!

After the Great Sage resets the world, Yogiri and Tomochika are forced into Van’s new game in order to obtain the Philosopher’s Stones—their only lead for getting home now that Luu is gone. Although Yogiri can’t use his power without breaking the game, Tomochika’s combat prowess and the old friends they made along the way may be just enough to get them to the final boss. Everyone’s in for a surprise, however, when the Philosopher’s Stones start disappearing from the game...including the stones the party’s collected so far! To make matters worse, the Great Sage finally makes a move against Yogiri while they’re coming to grips with the missing stones!

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.

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.

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.