The new hit anime starts up, and the manga ends. Worked for Demon Slayer, why not for Mashle?
As everyone has noted, it's Harry Potter with One-Punch Man as the main character, but while Saitama in that is shaped primarily by boredom, Mash is driven by absolute simple-minded goofery. He's an absolute dumbass in a way you see from Goku or Luffy, but multiplied by 3. If you can get behind that, then you'll have a lot of fun with Mashle.
The art starts off a little rough, but the action scenes shine throughout with beautiful spreads of the incredible feats of power as Mash fights overpowered foe after overpowered foe. The characters are all fairly flat, but there are enough of them to keep jokes circulating! You'll not find amazing character development here, but what little there is does feel nice. It's not a particularly deep series but it made me smile throughout, and has enough imagination to elevate it juuuuuuuuuust above a cheap parody of other, more developed franchises.
Definitely worth a read for a fan of action or comedy manga!