All My Beasts Are Legendary - Chapter 469 - Slave mark, successful!

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

[Cover] NOW HIRING — URGENT — Ghost Story Specialist Corporation Daydream Inc. (Ltd.) Insane Benefits – Come to Work Immediately ※ Note : The company is not liable for any injuries or fatalities that may occur during the course of the employee’s duties. —— A pop-up event for some ‘modern fantasy’ media I loved so much that I even took a precious day off work to attend. On that day, I ended up transmigrating as a character in that very fantasy world. As none other than a newly hired employee at a famous large corporation! A dream job with great benefits, an excellent salary, and even kind and competent bosses. I’m using the information I know about the world to rise through the ranks at lightning speed! Am I happy, you ask? Please, just let me go home. I’m begging you. ※ Note : The genre is horror.

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