I briefly heard about this manga, but I never gave it a read, so when I heard the anime was out I decided to give it a try and what a disappointment the state of shounen.
The characters, which in the first four episodes were basically the two protagonists and one antagonist, are too one-sided. The male protagonist is one of the wimpiest main characters I have ever seen and for it to be popular, people are seeing themselves too much on him and even when he gets his power-up - that comes with the price of losing his private parts, why? Who knows - he is still a downer, but a badass downer, so that's okay, I guess (?). The female protagonist is yet another example of "gyaru that falls for otaku", a common trope, but she seems to have actual room for improvement that will be limited by the mangaka writing skills. The antagonist is a cursed spirit in a form of an old lady obsessed with wienies, but that's okay because later on it is explained she appears in places where teen girls were brutally abused and killed and she would help them pass on, so we can only assume she hates penis because men are rapist and she will take what is most important to them - and that is my interpretation, it wasn't mentioned so far in the anime - and, to be honest, that's a take I wouldn't expect in a shounen. However, on episode 5 it all boils down to the protagonist, that was cursed by the antagonist, reacting "OH SHOOT MY BALLS ARE MISSING!" and the whole build-up they did in the previous episode was just a stupid joke out of a serious subject "lmao gottem". Oh... there's also the sexy grandma, that you can only tell she is a grandma because her granddaughter calls her so; some Japanese people look younger than they are and there are some people that are lucky on their genes, so maybe she represents those very few people that are old and still young looking and sexy?
The art is alright, feels like it is the standard of popular stories nowadays, but the colouring is so bad, no shades, no shadows, seems like studios are cutting costs on everything they can and that's what we get. The animation is mostly limited, except in some very few action sequences and it gets a bit better.
What I do want to praise despite all that is how incredible is Shion Wakayama's work as the voice actress behind the female protagonist, she is doing an incredible job! Can't say the same about the other protagonist which sounds like the same character in every production he works on.
BTW, I have seen some people saying how sexualised this is, I don't see a problem with that, the 2010s - or maybe even late 2000s - that stopped sexualising stuff in Japanese media as often, before then it was quite common. Is it a good thing? Does it add anything to the story? That's a whole different issue.