Hello, and thank you for your kind words! Now to answer your question, as it stands, the game being just four months into its release, hasn't delved deeply into the narratives involving other Crimson Demon girls. Tho, I wanna confirm you that there is a plan in place to introduce these characters as the story progresses. Regarding Luna and Sena, yeah they are indeed gonna be a part of the harem. Additionally, the game features several new characters, which I'm sure you would definitely like.
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Thanks for the quick answer! I will be honest, I don't care much for OCs in a game of a specific series, but when I try out the game I will definitively give them a chance, just personally happy to know the other Crimson Demon girls will get screentime, the movie and the Megumim spin-off made me like them a lot, that village just seems ripe for a Harem setting to happen honestly XD