Although they’re brothers, their appearance and personality are completely the contrary!! Suddenly one day, these two completely different brothers switched souls!? After possessing his cute, girly little brother’s body, the hard days of the tough big brother begins.

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…?!