VisualKoFey

Vincent lost his parents at a young age to an unknown infection that mysteriously spread in a large city which was holding a massive worldwide event. He survives but he becomes mutated by the infection. In the end, he blamed himself for his parents' deaths because he was the one who insisted on visiting the event.

Years later, Vincent meets with an infected survivor named Kevin, who helped him heal his heart. However, not all stories have a happy ending. Unfortunately, Kevin would pass away ten years later and leave a book with heroic tales as promised behind. 

However, the book wasn't as it seemed and after Vincent reads the book, it teleports him to the world the book depicts. A world of sword and magic with a horrible twist. Heroes are referred to as invaders, so people hate, persecute, and kill any otherworldy hero summoned to their world. 

As an oddity to the world and possessing an oddity residing in his body, Vincent becomes the only person in the world to awaken two classes. A Hero and a Mutation class. The more retainers he acquires, the stronger he becomes through mutation.

This is the journey where Vincent starts from naive to brave, zero to a hero. From a single young adult to a harem king, from a nobody to an important person to many. 

As Vincent tries to survive with people he can trust, he would receive many titles such as Harem King, God, Miracle Worker, Hero, Husband, Master, King, Monster, and many more.

Multiple questions will haunt Vincent's thoughts while living in the new mystical and strange world.
Go back to Earth?
Protect his new loved ones?
Find the mystery of the teleporting book?
Or create a haven where he and his loved ones can live in peace? 

These questions are for the readers of the book of heroes to discover as his story unveils itself.
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Chapter words 1,800+ (1-182)
Chapter words 1,600+ (183+)
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Discord 
https://discord.gg/CSg5Baf 
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Summoned and Unwanted

"Money moves mountains, they say. Regrettably, unless both of you know a noble who can help go against the Blackheart family, I don't think you will be able to live a peaceful life in Lusterfall City for a long time. You might better pack your things and leave in less than a day of entering the city."

"I know it sounds drastic or crazy, but you have to remember one thing. Everyone gets to live only once. Thus it's better to choose a happy life instead of a regretful one."

"Deciding to leave it to fate and see how it goes or pack your thing in a hurry and go. You are the one who has to decide since it's your life." Vincent ended his suggestion.

[I agree with your thinking. Furthermore, Demel Blackheart would discover how something went wrong with his disgusting plan to make money. Telling these girls to leave by mentioning a possible future is the best way to go for both them and us.]

Obtaining proof of what occurred