Spoiler warning, but the whole premise and plot get wasted.
You died fighting a big dungeon boss, your healer managed to pull one last trick is to make you regress.
By regressing, you keep all your knowledge and you aren't a toddler but a kid but a kid with great knowledge.
And the best is that this is your own body, so no excuses about not being used to another foreign body. So you know your peak and you can now train to surpass yourself and help those who cared for you.
Pretty good premise at the beginning with a lot of goodies.
But the author makes waste of it and throw everything to the window.
MC complains he isn't used to his own body... He cannot move like he wishes, well yeah.... you are a kid now.
Friends of the MC has a parent that can make fruit drinks buff you and give you an edge, refuses to drink and get overshadowed by everyone. Aka by chapter 37 he is officially weaker then all of his friends because he told them to drink a buff potion but since he refuse to do so his growth has been slower.
Act arrogant but has no weight to back that arrogance.
He went for an ambush against someone higher rank then him but decided it was not chivalrous to ambush people so decide to do a fair fight, looses badly so need to take drugs to compensate. Everything could have been avoided if he actually got rid of the problem instead of letting the problem grow bigger.
So much for a high ranking combat veteran regressing with all the knowledge from the future.
Also, it seems MC is oblivious about his parents background and work. So he technically has a very low knowledge of the world outside of combat.
The world building and world logic with the their powering system is poorly written.
This is why I don't recommend it. At first it started with a decent premise. But toward the end of season 1 the author struggle to know how to balance the world, his friends and the MC. Thus choose to nerf the MC and emphasis on his friends more overshadowing him completely. The MC is supposed to be strong because he has an edge but the author doesn't know what to do with it.
I fail to see any motivation from the MC and author. The story is going nowhere, the universe they are set in is broken to the point if the monster are going to wreak havoc, well, human does it better left alone.
Story up to chapter 55, he is still a kid...
Art wise it's good, not too much ugly CG background or inconsistency.