Lol, I obviously noticed that too. I was just wondering why it was changed but the other women's backgrounds were not. Seems like the developer has some reason for it.
Viewing post in Quickie: A Love Hotel Story (PUBLIC DEMO V0.24.4p) comments
Sorry for the delayed reply!
Back in 2018, Patreon updated their guidelines which didn't allow incest, so we changed Reika's previous backstory. You can read our official post about it here: https://www.patreon.com/posts/reika-change-17985850