The story is a bit original, because this guy have to marry a girl who can accidentally be his younger sister. And lucky the protagonist isn't an mediocre idiot, but still not a Don Juan.The art is good so far as i saw, good quality.
Nothing to say about the music, not bad. You must watch if you like romance, and harem. it's quite enjoyable if you look for an "ecchi comedy romance". But don't be fool and don't look for a "Clannad" or "Death Note" in this anime.