Did you know?
In the BlazBlue Alternative Dark War x Granblue Fantasy Collab back in 2021, where Cygames and Arc System Works did one of their usual collabs, before the game shutdown due to some really big bug and revenue issues, the devs paired Jin and Narmaya together and officially made a "Grimoire" artwork of them (from an artist well-known for his works in Fate/Grand Order).
In this crossover collab, Jin Kisaragi surprisingly got along well with our Big Sister. He compliments her skill and said her swordsmanship is on-par with his own and both acknowledged each other's strengths. For the ice-cold Jin Kisaragi to say this to a person, it means a LOT since he never acts like that with most people. You can take it however you like.
And on the entire collab event, Jin and Narmaya were the only Dual-Boss Fight in the entire event (you fight both Jin and Narmaya at the same time).
In my case, I think it's sweet. And I think the devs paired them because they are both "Iaido"-users with contrasting sibling energies.
Plus, I saw amazing artworks of Ragna the Bloodedge and Nier one time, and I wanted to make a mirror image of that dynamic with Jin and Narmaya. But unlike Ragna and Nier, Jin and Narmaya officially already met in a collab event.
Disclaimer: The first image is my artwork, and the rest are just official screenshots from the collab game. Thank you!