We all know the pattern,
Mao is trying to get together with Mizuki, and will confess to Mizuki during the trip.
Since Their trip overlaps with the school trip, Mizuki and Himnata end up having sex and are likely caught in action by Mao.
Mizuki rejects Mao and Mao leaves for good.
It’s possible that Mizuki and Mao kiss and Mizuki realizes that she loves Hinata.
We could also see Hinata running away and Mizuki cheating after her and confessing to Hinata..
The daughter is relieved to find out that her mom is no longer involved with Mao, only to find out that Mizuki is extremely happy with her best friend (Hinata)..
At the end of the arc, Mizuki and Hinata continue their shenanigans..
The whole premise of the manga depends on the relationship began Mizuki and Hinata..
That’s my guess, let’s see how many of those points will come to pass..