[Zuul]

Mikono is not unfaithful though.
She may or not may be attracted to Kagura. All we're sure of is that she feels pity for him as well as this nostalgic feel...
Mikono has never shown any will of dumping Amata for Kagura. After all, they haven't spent enough time together for him to be any kind of rival...

You cannot blame everything on Mikono.

Things sure would have worked better for them had Mikono looked more guenuinely interested and acted forward.
But Amata is also responsible, spending his time angsting about Chouchou hating him, or that destiny thing Mikono doesn't even believe in or some super underdog love rival who cannot even spend time with Mikono anyway. Basically angsting over nothing instead of taking action.

After a while I ended up doubting they were really into one another, they were just looking too unmotivated to move the thing forward. Either I'm on something here or just fooled by the sloppy pacing.