"he's making his move again" so he's tried multiple times to get with Oosawa. Letting him know that the person he is currently flirting with is already in a relationship isn't toxic at all. How could anyone see it that way? Imagine you're flirting with someone and they hide the fact they are in a relationship, that's significantly worse than being open about it. A simple "sorry she's in a relationship already" is the best thing you can say.

omg I relate to Adachi so much. I can't handle a relationship(friends or dating) with more than one person at a time. I want to put everything I have into that one person and I don't want to interact with anyone else. It's a very unfortunate situation to put that other person in though because most people have multiple friends or people they want to interact with. Idk the point of this post just ranting I guess. Anyways THIS MANGA IS TOO CUTE I LOVE IT SO MUCH

omg omg omg omg they are actuality together and Shima said she loves Adachi!! I'm gonna cry it's waaaaaay too cute!!!!!!!!!