The servant is the Great Demon Emperor (Volume 1 is the latest issue)

Publisher: KADOKAWA/Media Factory
Author: YEXIAO, Hongshu, WERCOMIC
Size: 128mm x 182mm
Number of books: 1
Language: Japanese
Category: Youth manga, manga
Latest publication date: 2022-11-22

Synopsis:
Reincarnated life. In order to return to the top again- !!

Demon Emperor's Takuichi is killed by a close while approaching the "Kyumyu's Mystery", which is said to have been left by the Demon Emperor.
However, after that, it was reborn as a boy's body- !!
The purpose of the boy and the universal revenge spirit are driven by the life where the revenge spirit aims at the top again !!