DelzGB

Within the virtual world of “Avalon Online”, Finn, or otherwise known as “Echo” within the game, was one of its greatest players. After logging off from a long session, however, he notices something awry outside of his apartment. 
The streets were flooded with chaos, screams echo through the night, and hell is loot loose. Monsters from Avalon Online are running through the streets, wrecking havoc. In the midst of this hellish awakening, Finn is greeted with the one gift bestowed to humanity in this dark hour:
[...Assessing life experience…] 
[Assessment Complete] 
[Name: Finn Thorne] 
[Age: 20] 
[Designated Class: Assassin] 
[Starting Level: 5] 
[A [Legacy System] has been bestowed to you for your accomplishments within Avalon.]
[Assimilation System Awakened.] 
In this twisted turn, as the world as it was once known is gone with the arrival of magic and monsters, the remnants of humanity must level up if they wish to survive. 
Finn is left in this dark, hopeless apocalypse, using his own experience from Avalon Online to best survive what seems to be an impossible task.

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Level-Up Apocalypse: Surviving With The Assimilation System

After finishing his quota for the day in programming, the idea of sitting around in his apartment didn't seem right. As he laid in bed, staring up at the ceiling, he couldn't stop thinking about all of it–the apocalypse, the monsters he fought, the people he met.

Most of all–he thought of her.

'Fate, huh? Coming out of all of that, somehow, it would feel ignorant to outright deny it exists,' he pondered.

Turning over, he glanced at the clock on his bedside stand–[8:08 P.M]. Getting any sleep felt like an unreasonable task as he slid out of bed. He couldn't get her out of his head, nor the words of the reborn Creator–

'...If a thing like fate exists, then going out there–it's the right choice,' he thought.

Humanity; Fate