One of the best, if not THE best manga i ever read. - Art is fantastic, you barely see better drawn character AND environments in any other manga - The story is very good, even if he died as a mature person, he now has a loving family so these are kind of new things for him so he might act naive so that's understandable. The story follows how he develops his skills, how he understands his abilities and the world more, and his interactions with plenty new characters. Some people didn't pay attention when reading the manga and complain that the author forgets stuff, but itsclearly mentioned for example that after his first Leviathan summon he is unable to create drawings on scrolls anymore. they burn up, its actually mentioned about THREE (3) times so far. Yet people complain.. off..
- The story doesn't forget about the other characters either, most other people become stronger at their paces, the princess develops her skills, his other colleagues do so too. And slowly, their relationship develops too.
- The story also keeps a few mysteries and shows scenes that will be relevant later on, so always pay attention and then the time comes you will understand what and why some things happen.
- Most manga mostly show only things that happen while the MC is present, this one also has moments where we see how other characters acts/react/plan so there is also a good amount of world building.
- As a note, there is a bit of breasts showing in this a few times... about 3-4 chapters? (out of 173 so far). Just in case you see the "suggestive" or some "erotica" tag or something, those scenes are not the focus of the interactions or a part of the story (and MC is only involved in 1 scene)

Honestly, im checking for new chapters everyday, i have it bookmarked. Thats how much this one impressed me. Its a manga i would recommend to anyone looking for the "growing powers" trope.