Popular? I mean, I guess the post-canon 'they finally talk' scenario is everywhere. It's not really a specific storyline so much as a general vibe everyone's chasing—these two messed-up people trying to figure out a relationship after all the secrets and trauma. The better ones don't just slap them together romantically; they let the awkwardness hang in the air for chapters, with Kana trying to be an idol and Akane doing her detective thing, and their schedules only aligning for these painfully stilted conversations at convenience stores.
I've noticed a weird split in the fandom, though. One camp writes them as this mature, subdued power couple quietly supporting each other's careers from the shadows. The other leans hard into the crack potential, like 'what if Akane used her analytical skills to become Kana's ultimate obsessive fan-manager' which is... a choice. Personally, I skip anything tagged 'fluff'—feels totally off-brand for them.