That looks more like a live triangle than a harem.
Ajisai is also (kinda) in the mix from late vol 1 of LN, but I don't think that it has harem/love triangle tones. It's more like MC is really, really traumatized by her middle school experience and has a very hard time denying people, which seems to lead to people both, taking advantage (that's what I'm guessing will happen in vol 2 /w Satsuki, looking at illustrations) and misunderstanding stuff (Ajisai - although that's even more of a guess, since vol 3 is not even out yet, so not even illustrations, just read that it will be focused on her).
Honestly, the whole dynamic IMO is a bit similar to the experience described in The Private Report on My Lesbian Experience with Loneliness - she barely learned how to walk, socially, and she is thrown into very advanced social dynamics involving all kinds of difficult people, that completely overheat her circuits. She also loves to put herself down and overthink stuff. Add gay panic on top of that and it's a total mess.
The vol 1 LN experience is like watching a trainwreck - it doesn't even feel good most of the time, yet it's somehow hard to avert your eyes. It's really hard to call it a romcom IMO - it's 70% drama/angst/assault/confusion, 20% more heartwarming stuff, and 10% comedy, if that.