zeref_dragneel1214

Alex a serial killer was transmigrated just before his trial into an F-Rank Demon. Finding himself in hell he was shocked to know that hell was connected to many worlds. And Demons were attacking these worlds for resources. With a system by his side watch as how he becomes a powerful Demon King and make a name for himself in cosmos. 
 
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I am a new  Author and English isn't my first language. So hope you understand. I am heavily inspired by Custom Made Demon King. 
So if you see similarities between them just accept them. 

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No harem or even romance (maybe after a while)

Table of Demon King: Wreaking havoc as a Demon

Table of contents

Volume 1