This looks like chibi monogatari characters, though Oshino Shinobu was a chibi to start. Could be wrong, the artist style is too far departed from Shaft's to be sure.

leminlyme said:

This looks like chibi monogatari characters, though Oshino Shinobu was a chibi to start. Could be wrong, the artist style is too far departed from Shaft's to be sure.

It was an original h-manga series. A lolicon series.

CodeKyuubi said:

It was an original h-manga series. A lolicon series.

Link?

Cover Image of this book (1080 JPY): http://www.amazon.co.jp/dp/4864366810/