I'm not a fanboy saying "perfect" to a romcom anime because I just liked the girl :D but this show is really close to being perfect.
After watching Horimiya, Rascal Does Not Dream of Bunny Girl Senpai, Sing Yesterday for Me and Higehiro recently I have some fresh experience to make a comparison here.
Horimiya and Rascal came on top for me but I had one major issue with both, that those strong MCs introduced in the first few episodes are just getting neglected later on and all we are left with are just some subpar side characters. *meh* I just watched till the end to know what happens with our beloved MCs, while I could not get really involved in the side characters' story *meh* (Both shows are great, don't get me wrong, I gave 8/9 for both.)
So, Call of the Night just doesn't forget about its MCs, not at all, there are new characters introduced, but the story still revolves around Nazuna and Ko mostly, which is cool. Also, not too much school life here, no cute little girls, no annoying whiny characters, the story usually happens in the night, it's a bit dark and the humor is sarcastic and adult. Nazuna's teasings are gold. The ending was a safe play, I'd say, but nonetheless, it was good and I liked how it addressed certain topics. (No spoiler intended.)
And there are other factors like the artistically beautiful presentation of the night city life, the awesome soundtrack, the retro neon vibes and the wholesome and mature script.
I've never expected to get interested in a vampire story, but here we go. :)
(The only complaint I can make is about our boy, he should have been a little bit more interesting, imho.)