No date announced yet. The PV is here. Check out the ANN article for additional cast/staff information. Synopsis of the manga from AniList:
Mona is the cutest girl in school, and she knows it. In fact, she’s worked hard to make her high school debut successful. But no matter what she does, she can’t seem to catch the eye of stone-cold stoic Medaka Kuroiwa—but she’s not about to give up that easy. Medaka, on the other hand, has been raised at a temple and was told to never become close to women. Who will win in this heated battle of wills?
I haven’t read this series, but your comment got me curious, so I checked out the reddit thread about this announcement to see what the sentiment was like. To sum things up, they are just as surprised as you. A lot of comments about how uninteresting the MC is and how poorly done the harem aspect is.
This one is probably a pass for me. It generally falls within the “cute girl(s) fall for boring guy for seemingly little to no reason” genre.