It's bad.
His entire backstory is shuffled through in 4 pages
He's all uwu blush when he sees a woman in damaged clothes, but seems absolutely fine with his cock swinging about in the air
He drops his identity in front of a magical lie detector after effortlessly killing some high-tier threat, and yet everybody around him treats him like some sort of insane child, because the plot needs people to act normally around him or else we might have an interesting story on our hands.
by chapter 3 he's geared up and already the bland adventurer he was destined to be, and i can't see any kind of truly interesting development on the horizon.
There are a couple core issues, first being his origins are monologued to us and over before chapter 1 is even finished.
Second, despite being some great evil king, he acts like a slightly proud isekai protagonist, saves everyone and uses magic to bulldoze his immediate problems. This isn't inherently a bad thing, but there's no intrigue, world building, or hints of personality.
Third, the plot of him being an adventurer needs everyone around him to underestimate or misunderstand him so we'll just have them do that, and then maybe let the romantic interest be in the loop because why the fuck not right? not like that's never been done before.
So many generic isekai have some sort of draw (Think deep lore, world building, interesting characters or interpersonal relations, unique art style, or just a damn good premise) that at least makes it palatable, this doesn't even have that. Even as someone who consumes vast amounts of trash isekai on the daily, i give this one a pass. 4/10, not impossible to read but so bland it hurts.