If you're stupid enough to think that a manga with "yandere" on its title won't contain any possessiveness, step back now. The yandere level in this manga is actually quite high.
If you can read this kind of manga, though, you're in for a good ride. The story is so well-thought, the protagonist is amazing, and I love how despite yandere tendencies shown by the characters, they try to control it even when they must struggle in the process