Skills, Attributes, and Experience. These are familiar elements to any tabletop RPG. Jack is intimately familiar with these terms from years of playing games, so he is shocked and excited when the entire world is integrated into a system governed by those elements. 

Follow Jack as he works to understand and navigate the new world around him. From heartbreaking losses to amazing experiences, Jack's life will never be the same.

A slow build, slice of life. Blue Mage MC who learns skills from monsters. Skills are not intuitively known and must be trained to be able to use properly. This is not a rapid rise to power story. 

It's more of a pseudo-Isekai. As the setting quickly changes to a Fantasy one. (with elements of steampunk and sci-fi but not until much later)

The story does not get very adventure-y until chapter 17.