The art style and the pacing of the story remind me of the old "I Am A Hero" manga. I really wonder how far this can go being based around a volcano erupting.
The game mechanics make no sense. She has 5 HP, she takes damage from things that would normally do no damage to a player because of how low her defense is. Yet somehow, when she does does take damage, she only gets damaged 1 HP at a time? Is every damage taken in this game a DOT? Are you...
The "Malfoid" character predates the trend by a number of years, ever since the first Harry Potter movies came out. It's just received a resurgence because a number of artists picked up on it recently after news about the franchise started picking up again as well.
It doesn't take much for anything to be taken as truth online, even when it's blatantly false. Just someone talking about something leads to many believing whatever they are stating is true.
Is this and 2 other manga really this artists only other works? Thier style is from 70s and 80s mangas characters, with a bit of early 2000s and current styles all mixed together, but the older styling really stands out.