Gentle Old Eyes

Setsuna blinks, then gapes with her mouth open, unshed tears glinting in her eyes. Her expression twists as she closes her eyes and the tears start running. She whimpers and launches herself to hug Zeno, and proceeds to mumble to his shoulder. Zeno listens as the 4-year-old cries for deaths that have long since been the past.

And Zeno soothes her, telling her it's okay.

But her cries only intensify, as she hears the tragically gentle and kind sounds in the voice of an old soul.
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Zeno from Akatsuki no Yona in Kimetsu no Yaiba. Short chapters, updates range in anything from once per week to once a month.

And a long time and a lot of chapters before the actual plot of KnY comes to play. Crossposted on Ff.net, where updates are mostly on schedule, it's updated ahead of this one.

Update: Lost most of my notes on this story and it's timeline. I will have to get them back before I start writing again or publishing with a schedule

Editing and changes in story as the manga updates and new information is revealed.