MTL - Demon Slayer Starts From the Proficiency Panel - Chapter 135 [135] One shot to break the city, one product level

A man who used to review novels dies in an elevator accident and is sent to the world of Teyvat [Genshin Impact] to live his life the way he wants.

What will happen when an unknown being like him enters the world of Teyvat? Will the Archons hunt him, or will he hunt them instead?
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Disclaimer: I do not own the rights to Genshin Impact nor its characters. My only character is the main OC Yomite Hissha.

Covers are also used randomly either from other artists or drawn by myself. So the credit goes to them.

My discord server: https://discord.gg/qpDTvSj3TC

Please support my Patreon for more releases and faster upload. If it goes well I am thinking of quitting my job and focus fully on writing. That would be nice as my job is really annoying.

https://patreon.com/StickSwinger

This story is my first wish fulfillment. It will be a little different from Genshin Impact's story, since the game is updated so often and things are added or changed. Currently it's patch 2.3 and I have been playing the game since it came out. So I am following the story closely, but...

It will not always be the same story. I'll do my best to get as close to the original as possible with my writing skills.

I will primarily focus on adding new things as well.

The romance will be slow, but we will get there.

Smut is out around chapters 120, mostly to develop romance before going into it.

Harem will be expanding, but at a decent rate...

I want to develop the characters first before I undergo another harem expansion.

Kubei was just an ordinary pencil and button pusher working a day job, hating his boss and making horrible speeches when one day he fell asleep after pushing an all-nighter. When he woke up, he was bound to a chair, facing three creepy robed women and in a body way too young and way too weak to be his own. As he slowly came to, he realized that he was no longer in the same universe as he was before. He had teleported to the Kingdom of Helius, where an all-powerful church rules its lands and wages war against the elusive group known only as Mages. Armed with an incredibly cocky neural interface that just won’t shut up and his own sheer wit, our MC will find himself not just fighting to survive, but maybe even something bigger than himself.

A serious accident caused the protagonist’s brain to have an unusual mutation. This changed the brain development that it opened the door to a mysterious universe. Not only he obtained a ‘god-like’ powerful telekinetic control and mental perception, he also had an abnormal analysis and memory capability comparable to super computer. Having such super brain, his rough life began.

Brain development progress 10%…….20%……50%….80%…. …100%

- Description from Novelupdates

When I was 15-years-old, during the year that I graduated from middle school, my father told me this.