Very cute!  I do think that the writing is rather silly as is the premise, so it suits it well, though the writing comes off as a bit...stiff or stilted at points.  It's awkward, almost, which isn't necessarily a *bad* thing and I don't think is entirely off as the characters themselves are a bit awkward (at least Riku and the protagonist are as that's the route I played), but it feels a bit...off.  Since this is a jam game meaning that the time span with which this was created was smaller in scope this is understandable, but I think it could have been better with some more editing done to the script.  Additionally, there is a good amount of text box overflow where the text bleeds into the UI elements when it shouldn't.  I don't know if this is due to me having played in browser or not and the screen being rather small however.  I think with some polish this game could shine a lot more, but it has a lot of potential and is at least worth looking at for the lovely artwork and cute characters if nothing else! <3