Demon King Goes in Highschool

His father, who had been imprisoned under false accusations of mu*der, committed su*cide.
The son, who firmly believed his father would never do such a thing, fell into a vegetative state due to his friends’ bullying.
His soul, defying the natural order of reincarnation, escaped and became a corrupted soul, a demon.
The sole reason he remained in hell even after becoming a demon was to find his father’s soul.
As he spent time in hell, he eventually rose to the highest position.
However, his father’s soul was nowhere to be found.
Determined to uncover the truth, he decided to return to his original world.
Thus, the Demon King descended to Earth…