Man, Monika x Mita? That’s a rarepair I haven’t seen pop up on the main feed in ages. Most stuff I remember was from like, 2018-2019 peak DDLC fever. The big storyline back then was post-'Salvation'—the idea of Monika, after her epiphany and deletion, somehow crossing into Mita’s world from 'Kagerou Daze'. Writers loved the angst of two self-aware, lonely digital entities finding each other, both trapped in their own narratives. It was less romance and more a bizarre, melancholic support group. I stumbled on one called 'Echoes in a Headphone' that was just them talking in a void for 20k words. Not much 'plot' in a traditional sense, but the dialogue about purpose and observer bias was weirdly gripping. You’d have to dig through AO3 tags or maybe even tumblr archives now.
Honestly, the ship never had the momentum of something like Monika x Player. Most fics I saw were crossovers of convenience rather than deep dives into their dynamic. The popular trope was 'shared loneliness'—two beings who understand the fourth wall, trying to build something real from code and music. It’s niche, but the fics that did it well had a specific, quiet ache to them. Good luck finding them, though; the tag’s probably buried.