Dakara boku wa, H ga dekinai.

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. 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 off his lecherous spirit, draining his ability to enjoy... well, the things that teenage boys normally spend most of their time thinking about! Now the poor degenerate's only hope of getting his licentiousness renewed is to join the Lisara on her quest, since when she leaves our mortal plane he regains his normal immorality! But Shinigami can be really harsh mistresses, and it's going to be anything but easy to go back to being sleazy! (Madman Entertainment)