I'll point out that the anime produced for this is barebone and cheap. This is due to the fact that it's produced by Arvo Animation which is basically an indie Anime studio (as in Indie game development studio). It's a company with only 10 employees and with a worth (equity) of only 3M yen (approx. 28K USD).
To give an idea, that studio has only produced 1 series prior (Bokutachi wa Benkyō ga Dekinai) and this style is completely out of their current set of skills. You can see they are using, partially, some other studios' "tricks", but fails at expressing the same kind of feel and aura as the manga. (They also change a LOT of details that makes the manga unique for the sake of cheapening the animation cost.)