MTL - Machine Storm - Chapter 105 childish demon

Leon is an average high school student who likes to watch anime and read novels.
He's about to cross the street, only to be greeted by a truck and died.
But, he got reincarnated as Uchiha yet dead again because Itachi killed him.
Leon got reincarnated again as the grandson of the recovery girl.
He got kidnaped and tortured by All For One.
After his third death, he got reincarnated as a son of Bibi Dong.
In this fourth life, he wants to change his fate to become the strongest.

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I finally managed to kill the demon lord.

Oscar, a destitute young boy, died in a tragic accident and was reborn in the forgotten realm. As a member of the lowly Birch tribe, his solace comes from the fragments of a guardian's spirit, residing in his soul. After the decimation of his family in the hands of a powerful race known as the dreads, he embarked on the part of revenge, leading him to the path of transcendence.

Abigail’s only crime in life was being born as the mute daughter of the deceptive maid, who drugged her boss and got pregnant for him… or so she thought.All her life she had to serve her stepsister, Genevieve, attending to her every whim. While Genevieve used every opportunity she got to make Abigail’s life hell, even to the point of seducing Abigail’s boyfriend.On the night she resumes college, Abigail crosses path with Jamal Jonas, a heartbroken elusive billionaire, who leaves behind a stuffed animal that belonged to his first love. Abigail keeps the stuffed animal, which stirs her long lost memories.Five years later, Jamal shows up again, but this time as Genevieve's new live-in driver.Working for Genevieve quickly places him near the supposedly mute and intelligent Abigail who he doesn’t immediately recognize, and soon enough, Jamal finds himself pulled in by Abigail's charms.Jamal quickly realizes there is more to her than meets the eye, and there might be more connecting Abigail to his first love than Genevieve.