BBAN-091 The female undercover investigator captured by a lesbian ~ The incident happened at the station... A lesbian named fallen to the earth ~

"A colleague's female investigator was drugged and became a cripple." Hearing the story, Aoi discovers a strange commonality with the unsolved case that occurred three years ago. With advice from her older sister Yukine, Aoi continues her investigation on her own, but the more she investigates, the more certain her suspicions become. She asks "Is the suspect in the station?" She thought that she had only friends, but she didn't know that "evil deeds" were rampant in the police station.