Hi! Thank you, I’m glad the mystery aspect caught your attention. :)
As for the love interests, all of the main romance options have already been introduced. There may be a few additional side characters and romance opportunities in future episodes, but the core cast is already there.
The second question is a bit trickier to answer without getting into spoiler territory.
Players will have the opportunity to pursue multiple love interests, but I wouldn’t describe Ethereal Threads as a traditional harem-building game. The romance system is closely tied to the larger story, so things aren’t always as straightforward as they might seem.
What I can say is that I’m not interested in punishing players for their preferred playstyle. Whether you focus on a single love interest or explore multiple relationships, both approaches can lead to good endings, and bad endings (as there will be several) can happen too.
Hopefully that answers the question without spoiling too much.