
Both of them are the issue.
Mugi has 0 self-respect and just keeps pushigg and pushing. She can't get a clue even if it hits her in the face.
Kurose must be the worst boyfriend in the entire shojo universe. He's distant, passive agressive and completely unable of payihg a compliment or being supportive.
How are we supposed to believe they make a good pair?

Both of them are pissing me off.
Kurose doesn't seem to * want * a relationship and although it's understandable that he doesn't want to spend every breathing moment with her, he should at least ATTEMPT to spend time with his girlfriend.
Mugi really needs to back of and think about herself as an individual and not as part of a duo. If I asked my partner to not do something and they countinuously go against my wishes, I wouldn't doubt asking for a break up.
I really hope Miyu Saionji is a reference to daa daa daa ヾ(☆▽☆)