After using a good chunk of my weekend playing it:
• All the art pieces can be found in Hitomi.la, and they're quite nice; I usually check in there first to see if I'll give one of these RPGMaker titles a try or not - and then, sometimes, I download and play these because I wanna find out the context/story behind them;
• It's so and so as a H-game. As others said, few artworks here and there; it's mostly for flavor, it feels (not enough to keep you playing one-handed, alas). But it is quite interesting and entertaining as a simple RPG game, and that's what held me longer than the usual 15~40 mins.
I only played on the easiest difficulty, because I was mostly interested in the story. Some things are a bit annoying (too many encounters, and NPCs blocking the path); but it wasn't difficult to level up and go through bosses and whatnot; it's entertaining.
• The characters are quite cool and so is the story. I usually ignore and stop playing these games after I get an overall 'idea' about the setting/story and see its art - but this one actually kept me interested, and I kept going.
So it's an 'overall ok' title; just not worth the full price, imo (although there is a lot of content as a 'game', so there's that to kinda justify it). It'd fit better as a mobile RPG, since I don't like to use PC time playing this style of RPG.
It's also a pity this is a one-time thing and there is no perspective of seeing development of the characters/story/world further.