A bit short but good.
The Japanese word for "white" is "shiroi"

The buildup of depression Chi would have sent Ranma’s danger sense into overdrive. Ciao

The contractions Ranma uses are killing me, but I at least think the summary is interesting. It's one of those fics that gets you thinking or dies to be expanded upon. Hopefully you give it the execution it needs.

Shirokuro means Black & White, but naming it that may make people think it's about Ryoga's dog. But why not just call this story black and white?

Anyhow, the concept is interesting. I've never seen a Black and White crossover before. Too bad you didn't actually get to the black and white part. Write longer chapters in the future.

Siroi
Shiroi

That should be white, I think.

VERY GOOD START! Looking to the next chapter.