Fallout Game Merchant 2.0 - Chapter 29: Invader Slain!

Nobody thought the end of the world as they knew it would come like this.In a dystopian future, 95% of the population was sent to another universe, one resembling the game Jack had played, “Elder Heir Online”.He would've normally enjoyed such an opportunity, but the company 'DiveCore', from his real world, came along.As long as any of them breathed, his revenge wouldn't be complete.Using his knowledge of the game, and willingness to go through the worst to exact vengeance, he will slowly become what he avoided when he played the game in the real world: a villain.

The end of the world is full of crises, but Su Chen says not to worry because he has the Red Alert System. That’s how confident he is. You say you have a lot of weapons? Sorry, I have more weapons than I can use here. Let me introduce you to the weather control device. You say the mutant beasts are very powerful? No problem, I have a way to deal with them…

A tree of 10,000 flowers, the world is the door.
The spells change a lot, but the hearts of the people are unchanged.

- Description from Uukanshu translation

A tale about the former leader of a special organization that served under royalty, now leaving his past life behind and unintentionally getting involved with the martial world.