It feels weird to be advocating for this, but…
Kani should shoot for the throuple.
- She's fallen for both Naoki and Naho.
- Naho would probably agree on the grounds that it's a mature kind of development in a relationship… and we saw that grin/ara-ara combo back in chapter 16, page 14.
- It might be a little tough to get Naoki on board (specifically, getting him to "see Kani as a girl", as Kani put it), but he'll probably follow along once Naho gives her approval.
The only real difficulty I foresee is keeping Naoki from being murdered by his peers if they find out.