This is apparently free for a limited time. Other stuff on sale too.
小百合さんの妹は天使 1

http://www.amazon.co.jp/%E5%B0%8F%E7%99%BE%E5%90%88%E3%81%95%E3%82%93%E3%81%AE%E5%A6%B9%E3%81%AF%E5%A4%A9%E4%BD%BF-1%E3%80%90%E6%9C%9F%E9%96%93%E9%99%90%E5%AE%9A-%E7%84%A1%E6%96%99%E3%81%8A%E8%A9%A6%E3%81%97%E7%89%88%E3%80%91-%E5%B0%8F%E7%99%BE%E5%90%88%E3%81%95%E3%82%93%E3%81%AE%E5%A6%B9%E3%81%AF%E5%A4%A9%E4%BD%BF-%E3%82%B3%E3%83%9F%E3%83%83%E3%82%AF%E3%83%95%E3%83%A9%E3%83%83%E3%83%91%E3%83%BC-%E4%BC%8A%E8%97%A4%E3%83%8F%E3%83%81-ebook/dp/B0193253SY/ref=dp_kinw_strp_1