Sanzen Sekai No Karasu Wo Koroshi
Complete | Saiki Keita | 2006 released
It's so short which sucks. A military man decided that he will commit suicide in a day with other people so, he tells his vampire friend/lover the bad news. After the Hot sex scene, the Vampire made him a vampire and told him that if he wants to suicide then they'll both burn in the sunlight or the military man could have some blood to live with his vampire lover. In the end, it looked like he wanted to live instead.
Dakaretai Otoko Ichii Ni Odosarete Imasu.