I think it will somewhat depend on Kuro. Michi can be a very sweet person and will try her best for the people she cares about, but she's painfully naive about relationships sometimes. If Kuro breaks her trust or expectations of him, I can see her becoming a jaded wife without too much effort. You can already kind of see it with how her Niji manager treated her when she joked about taking her play button home, she simply never trusted them with anything ever again.
And I quote: "And they apologized. And Bethany (Michi's NDA circumventing 'Friend in Niji' name) forgave them. But Bethany never forgets. Bethany will never ever forget that. Bethany remembers."
...Yeeeeah. If Kuro is willing to go the extra mile for Michi, they'll be fine together. But he'll need to be very very careful not to get on her bad side.