Man, I've never seen a story where I actually want the cheaters to get together in the end like I have with these 2.
I was kinda hoping for them to be together, but the more "playing" she does with her NTRy stuff, nudging him to then run away and stuff, all that secrecy, I started loosing that hope. Then the train called Yako came, and it blew through the rest of that hope, splashing it all around into ditches next to its rails. Now I seriously hope Yako wins, and wins proper, not some shit like they date, but break up later when the truth about Shizu is revealed or something, but that MC falls in love with her and forgets the other 3 nut-cases, and stays in a happy, healthy relationship with Yako.
Preferably, Yako will learn what the other 3 do, find out fast that Takt is gay for MC, realises that what the other 3 are doing is unhealthy for out boy, has a serious talk with him and possibly with the others, so that she can pull him away from those that stress him out and slowly, nicely, possibly sexily heals his kokoro.