Gaishuu Isshoku Ch 50 -

It started as a rumor. A patch of grey on a shop sign. Then a whole building. Then a block. Now, Hazakura was a charcoal sketch of itself. People’s clothes, faces, even their eyes — drained into monotone. Only a few still remembered red.

And for the first time in fifty chapters, a single drop of crimson falls from the sky.

Kaito raises the shard. The great grey eclipse trembles. gaishuu isshoku ch 50

was one of the last. His left eye still held a fleck of amber. He hid in the subway tunnels beneath the eastern ward, where the Color Eaters — slender, faceless things that moved like spilled ink — hadn't yet reached.

It seems you're referring to (possibly a manga or light novel series), specifically looking for a story related to Chapter 50 . However, as of my current knowledge cutoff, there is no widely known or officially translated series by that exact title in mainstream manga databases. It started as a rumor

“Don’t look at the sky,” she whispers.

Yuki looks at him. “I want to see the sun set again. Even if it hurts.” Then a block

That said, if you’re open to a — I can craft a short original story inspired by the title’s possible meaning.