Aharen-san is definitely one of the funniest manga I have ever read, up there with Nichijou, Grand Blue, and Kaguya-sama. If you're into dry-but-ridiculous comedy, I think you'll love it.
Aharen herself is adorable, thanks to her small height, quietness, and kuudere nature. She pairs ridiculously well with Raidou, who is tall-ish, has a ridiculous imagination, and is similarly a kuudere. Having both the main characters exhibit the same nature can be hard, but Aharen-san nails it spectacularly. Every daily occurrence becomes something ridiculous, thanks to Raidou's over-imagination and Aharen's inability to speak up. In the end, any misunderstanding is ultimately cleared up for a satisfying
and funny ending. Pretty much every chapter makes me laugh, and I always look forward to the next one.
If you like Tanaka-kun is Always Listless, you'll probably like this manga as well.