u/I_E_D_B

Context: I am long past my old 86 phase. The last time I read the series was when I started Volume 11 in September of 2023, so... over 2 and a half years ago. I decided to finally pick the novel back up after a recent rewatch of the anime, so I'm fully back in it now. But now that I'm back, I'm reminded of the fact that the Michihi we all know and love goes by her last name, Michihi, rather than Reki. It's been too long, so I really don't remember if it was ever addressed why she always goes by her last name instead, as opposed to characters like Yuuto and Rito who both go by their first names. Would be fantastic if someone with a fresher LN memory could let me know.

If I had to guess, it's something to do with her being Orienta? It's clear she's meant to be the 86-world's equivalent of Japanese, and Japanese names follow a family name -> given name structure. But that's just my guess.