Yup, what he said. ^^ It's based off Sentimental Graffiti 2 - the insanely popular dating sim (of the non-H sort). The love interest that Rev. Doc was talking about is supposed to be the character that the player of the game would be - which is why the voice or face is rarely seen or heard, respectively.
It really is an excellent buy, and I'm impressed with the way entire, unrelated stories are told within 30 minute episodes. I especially like the opening sequence where it shoes each girl starting off on the proverbial journey, and you can see bits of their personality type. Like one is an artist, another is a singer and such. (I especially like [although I've yet to see the episodes] the space-case girl and the crazy girl hanging out of the tree).
I bought my copy at Best Buy (on a whim) for $20. It's rated 7+ but so far I'd lean towards rating it 11-12+. Looks like either I or the Rev. will have a review up soon, so keep your eyes peeled.