Real Man - Chapter 15:

Kuramoto Daisuke, a freshman in High School was suddenly exposed to someone vanishing in front of him. Turns out he was admitted to a Special Class full of Isekai Heroes that were regularly summoned to Otherworlds since the start of their Middle School. He was told that he was to become their Support to prevent each of the Heroes' fate of dying in the world they were summoned into. Though mediocre, he realized that his ability has a great potential but it needs a lot of hard work on his part.

Unconvinced of being just the Support Character, he vowed to excavate his mediocre ability, all the while supporting the Heroes using it.

And maybe more.

After struggling to survive for three hundred years in another world, Yang Qiu finally returned to Earth.

However, he was shocked to find that only one day had passed in Earth time. More surprisingly, his own sister didn’t recognize him…

And what’s worse, he hadn’t escaped from that terrifying dark magic plane at all!

To save himself, he has no choice but to take on the role of a savior…

[Fourth Crisis: Influx of Gamers] A deranged black mage disguised a magic plane as a game, deceiving even more deranged Earth players to rush into this other world and wreak havoc.

Starting with just a skeleton frame, equipment is obtained through plundering… and confiscation!

Undead, bandits, calamity—a trinity of a storm from another dimension engulfing the continent of Navalon, bringing both terror and the potential for peace, justice, order, and enlightenment.

Elder gods resurrections and the void encroaches—the battle for the end of the world begins. Since the three major calamities have gathered, the only ones who can stand against them are the fourth calamity!

Simple-minded Earth players, heed my call and take up your weapons to save this dark and magical OtherWorld!

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In short, MC inadvertently created a world, but as the creator of the world, he did not know the world at all. He should have lived here like a fish in the sea with some plug-ins that MCs always have. But now he is even stumped by the bugs in the instant world. Luckily, in this world he has found his shadow guard, or his lover? So the daily adventure is getting not so boring…

- Description from Novelupdates

A 29 year old civil employment exam student wakes up in a blank white room and meets a baby angel. This baby angel informs him that he died in his sleep due to heart disease like his father and grandfather. Remembering his mom and their last conversation he says that he will take on a series of life and death tests that the baby angel offers him. From this point on he must put his life on the line and fight in the stage called ‘Arena’. And Every time he clears a test he will gain abilities and weapons to increase his strength. All to clear the tests and get his life back. This is his story of his fights in the ‘Arena’.