The target audience is in fact not horny young men attracted to 2D girls. It isn't even ecchi. It is targeted to everyone with an open mind.
The message this show is trying to get across is that underwear is a lot more than just eye-candy for men.
It portrays painfully well what the state of the world is for underwear and how people can't shake off the belief that it is something shameful, something to hide and talk about only in secrecy -- which is a pity, because, as this show proves, there is a lot to be said there, and the designs are worth admiring.
While the anime is lacking in visuals, sound and unique characters (except Nayu), many of the problems it deals with no anime to my knowledge has dealt with before.
