Radical Blood Monster

Sagara Yuichi is an aspiring writer who was caught in a convenience store robbery. Despite having the chance to escape, he lingered to gain writers experience, and ended up getting stabbed. During his last breath, a strange guy appeared claiming it was fate. A few hours later he awakens and finds himself sleeping naked next to that strange guy. Then that strange guy tells him that his blood is \\\"S-Class\\\" and that he\\\'s going to be Yuichi\\\'s lifetime \\\"partner\\\". Will the pragmatic novelist be able to wrap his mind around all this...?!