Two couples. The first one is more on the cute/fluffy side, there's basically no drama. The second couple takes up most of the chapters and is far more interesting in my opinion. The characters have very extra and distinctive personalities and there's a lot of dark humor which honestly gave this manga that something that makes it special (it's also pretty rare even in comedy bls to have this type of jokes). It's clearly less fluffy and wholesome than the first couple, they're not officially together as boyfriends, they don't say sweet things to each other and barely kiss too, but you can still tell they really care about each other in their own way and that's what makes this so interesting.
The “Flow” In Flower