"Muchuu sa, Kimi ni" is... interesting. The first four short stories are linked by the presence of Hayashi, who is unusual, to say the least, and the last three focus on a pair of boys, Medaka and Nikaidou. Comic Beam is something of a seinen magazine, but this isn't really seinen, and despite the fact that the author labeled the Nikaidou series as BL when it was first created, I wouldn't really call this entire thing BL, either. It's more like... vaguely BL-adjacent. Which I love, personally.
It's incredibly funny, but the humor is brought about by absurdity, awkwardness, and near-surreal situations. It's not slapstick. On top of that, there are also extremely heartwarming moments. Wayama-sensei draws very convincing smiles.
The art is charming and much different than what you'd see in most modern manga. It's quite obvious that Wayama admires other mangaka like Junji Ito and Furuya Usamaru, and it's shown through the art style and even some of the gags.
I can't honestly give it a 10 because I didn't like one of the Hayashi-related stories. It wasn't terrible, it was just a bit boring in comparison.
If I had to sum it up in a few words, then I'd say it's a good collection of short stories about really weird teenagers.