Continuing the story of the previous season, the protagonist "Passerby" finally confessed to his classmate Kikuchi, so he left his identity as a passerby and became the protagonist of the BL world. Unexpectedly, Kikuchi was back to the handsome ex-boyfriend Igarashi. He returning to become the passerby again, so he decided to start over. The story about the man who defies the world of BL V.S. A world that turns every man gay begins again.

The hero played by Inukai Atsuhiro found he was one of the residents in BL comic world. He tried so hard to fall in love with girls. To avoid love attacks from handsome boys around him, he even read a lot of BL comic books for reference, but "BL Love Flag" still got to him in rapid succession.