Naomi X Seiko Novels & Stories

Honestly, most of the Naomi x Seiko stuff I've stumbled across tends to be scattered. I'd be surprised if any platform has truly 'exclusive' content for that specific pairing—it's pretty niche within the 'Kakegurui' fandom. I see bits and pieces on Archive of Our Own under the Hyakkaou Pairing tag, but it's mixed in with everything else.

That said, I once found a really long, character-focused fic on a Japanese site called Pixiv. The tagging system there can be a maze, but if you search the Japanese ship name (中込 x 西?), you might dig up some stories that never get cross-posted to English platforms. The language barrier is real, though.

I mostly rely on AO3 filters and hope someone tags their work properly. I don't think any site corners the market on this ship; you just have to hunt.

Honestly, I'm a bit conflicted on this pair because sometimes it feels like the tension gets flattened. A lot of the popular fics I see lean super hard into the 'soft, shy Seiko' and 'protective, stoic Naomi' dynamic, which is fine, but it misses the messiness that could make it really sing. That initial friction from their backgrounds—Naomi's more cynical, world-weary outlook bumping against Seiko's perhaps more sheltered or principled one—that's where the real emotional friction lives. It's not just about comfort; it's about fundamentally different ways of moving through a harsh world. I'd love to see more where that causes real arguments, real misunderstandings that aren't just solved with a hug by chapter three. The quiet moments after a fight, the unspoken resentments, that's the good stuff.

A friend wrote a one-shot where Seiko quietly starts adopting some of Naomi's more pragmatic, ruthless habits to 'protect' her, and Naomi is horrified seeing her own reflection. That kind of emotional mirroring, the tension of becoming what you fear or loathe for someone else's sake, absolutely wrecks me in the best way. That's the level of complexity I crave but don't always find.

I feel like a lot of fanfic for Naomi and Seiko from 'BNA: Brand New Animal' kind of misses the mark, honestly. A ton of fics go straight for the 'opposites attract' thing, which sure, fits on paper – human scientist and fun-loving tanuki – but it ends up flattening them. Seiko gets reduced to just being the 'chaotic' one causing trouble for 'straight-laced' Naomi, and their actual shared history and complicated feelings from the past get ignored.

What I really want to see is someone dig into that decade-long separation. That's the real goldmine. The forced proximity trope makes sense because of their living situation, but it's a backdrop. The core should be about two people who have been living with a massive, weird-shaped hole for ten years suddenly having to navigate filling it again, with all the awkwardness, resentment, and unspoken care that comes with that.