Uomi is my favorite character. At first, she was just this calm, smart, and diligent onee-san, and she tries her best to connect with her friends by making "cute" jokes... and then, she became an actual onee-chan and dotes her new younger sibling very much, to the point of making the others jealous 😂
That's because most ecchi slop are just: > Guy trips over and grabs breasts or walks in bathroom while girls are bathing > "kyaaaa" > Gets slapped or gets blasted out of the building Rinsa and repeat
I mean, one of the fan theories brings up the fact that Uomii called Tsuda, "Flag Crusher". According to it, Tsuda and the others are stuck in a VN of sorts that end whenever he ends up with one of the girls, causing a loop. So in order escape the loop, Tsuda crushes every single flag that pops up, most of the time in form of his tsukkomi responses to everyone else's jokes.
Every girl in this anime is not normal. The most normal one is just Hagimura Suzu (the short girl one) and the friend of MC sister. This Anime is so funny if you can take dirty jokes 😂