Just what the hell is a super seme-sama's living spirit!?

Yasu is a healthy university student who was working part-time at a butler cafe when he started noticing a strange change in his body. When he went to seek help from a self-proclaimed exorcist named Shinoda, that's when he learned that he's been possesed by a "BL spirit", a very troublesome type of "living spirit" born from the wild imaginations of fujoshis!!