Dakara Boku wa, H ga Dekinai

, is a Japanese light novel series written by Pan Tachibana and illustrated by Yoshiaki Katsurai.

Dakara Boku wa, H ga Dekinai began serialization in Fujimi Shobo's Dragon Magazine in 2010. The first volume was released on June 19, 2010, with a total of nine volumes released in Japan as of September 20, 2012 under their Fujimi Fantasia Bunko imprint. A manga adaptation illustrated by Shou Okagiri began serialization in the March 2011 issue of Monthly Dragon Age, and sold two volumes as of June 19, 2012. An anime adaptation produced by feel. was announced, and aired from July to September 2012 on AT-X and other networks. The anime has been licensed by Sentai Filmworks in North America.

Plot
The story centers on Ryosuke Kaga, a perverted high school student who makes a contract with Lisara Restall, a beautiful Grim Reaper, in exchange for his perverted spirit.

NEVER make a deal with a wet goddess you've only just met. That's a lesson Ryosuke Kaga learns the hard way when he foolishly agrees to let Lisara Restole use some of his "essence" to stay in this world. Because despite her smoking hot appearance, Lisara's actually a Shinigami, a Goddess of Death. However, she DOESN'T steal years off his life like any decent Shinigami would do. Oh no, instead she sucks him dry of something much more perverse by leeching off his lecherous spirit and draining his ability to enjoy... er... the things that teenage boys normally spend most of their time thinking about! And now that he's been de-debased and de-debauched by her un-dirty trick, the poor regenerated degenerate's only hope of getting his licentiousness renewed is to join the queen of mental-clean on her quest, since when she leaves our mortal plane he regains his normal immorality! But the termination of the probation of his reprobation isn't guaranteed, because Goddesses of Death can be really harsh mistresses and it's going to be anything but easy to go back to being sleazy!

Official

 * Official anime website
 * Fujimi Shobo

Other Sources

 * Wikipedia
 * Anime News Network
 * MyAnimeList (Novel)
 * MyAnimeList (Anime)
 * MyAnimeList (OVA)