Because they need to work as a team.
You mean you believe those two "work" together?
Well, in TWEWY, Two competitors that have made a pact had to rely on each other in order to survive. Neospark and Yuki are "forced" to work together to survive. (The schools have kind of an eternal rivalry)
I know, I have seen the walkthrough. They need a pact for their individual powers to work, aka the pins. What I meant was will those two cooperate well?
That, you'll see soon
I guess I will eventually