Guys, calm down. You need to put their relationship in perspective. Yes, it's been 153 chapters but keep in mind that we, as the audience pretty much only see the interactions between these main characters. There's so many things going on in their lives outside of eachother. Yes, Kazuya and Mizuhara had gotten closer over the past 50 chapters due to the movie, and even though that business relationship is over, I'm sure Mizuhara is still grateful to Kazuya for all he has done. She does care about him. But, at the end of the day, their relationship is not THAT intimate yet. He can't force his way into her business. With the movie relationship being over, the only thing left that ties them is the lie that they are telling Kazuya's grandmother/family and Kazuya has already stated that he wants to stop the lying......Kazuya is indeed in a very difficult position. He knows Mizuhara needs support, and he wants to be that support, but he's also afraid that if he pushes too hard she'll cut him off completely. It's the same reason he's so afraid of confessing his feelings to her. He's so afraid that it would ruin any semblance of a relationship that they have that he's willing to accept being in the friendzone as long as it means he gets to stay close to her. It's pathetic sure but completely understandable: He loves her, he wants to be with her, he wants to help her be happy and he's willing to sacrifice getting what he wants in order to do that. It's not like he hasn't tried to offer help, he outright told her that he wants to help her and she stonewalled him. He now finds himself in a position where he feels like he has to tread lightly, lest he destroys everything he's worked so hard to build. I think reaching out to Sumi for advice was the right call. Her relationship with Mizuhara is completely voluntary (unlike with Kazuya) and I don't think Mizuhara will take any involvement by Sumi negatively. Best girl Sumi to the rescue!