Ones I definitely think need to be implemented:
Childcare - Used for series whose primary focus is on raising a young child. Examples: 'I Became a Doting Father' and 'The Chick-Class Hunter is Filial'
Farming - Used for series where the primary focus is in farming and agriculture. Examples...
At this point I think there's enough series whose main theme is dungeons appearing in modern day that it deserves its own tag to more easily filter it from other stories. Please make a tag for it.
They're bringing flowers to the grave of the guy who turned into a demon and murdered a bunch of people, but not to the grave of the girl who sacrificed her life to save them. What ungrateful pricks. I think this is probably as much of this story as I can handle.
"Our old levels." That makes me even more sure that the reason he refuses to level up is because he lost all his levels and realized that strength given to you by some unknown power isn't as valuable as strength earned on your own, thus refusing to level up and rely on that unknown power once again.
I presume it's sort of a pride thing. Trying to prove that humans can conquer the dungeons without relying on some kind of supernatural power given to them by who knows what.