The man a strict female prison guard fell in love with was a murderer behind bars. Kozue Fuyuki (Ryoko Shinohara), a prison guard at Hikawa Detention Center, is disciplined, calm, and collected. She has always been strict with herself and others, but her encounter with murderer Reiji Kusaka (Jesse) changes the fate of both Kozue and Yusuke Saeki (Naohito Fujiki), the detective investigating the case... How will Kozue transform into a "villain"?! Inspired by a true story from overseas, an unpredictable "prison break suspense" and "forbidden love" story unfolds!

Kozue Fuyuki (Ryoko Shinohara), a prison guard at Hikawa Detention Center, has always been strict with herself and others, but she begins to feel unsettled by the words of Reiji Kusaka (Jesse), who has been transferred to the prison on suspicion of murdering his father... Meanwhile, an important tablet containing the data of inmates is stolen by someone, putting Kozue, the head of the detention center, at risk of disciplinary action. Meanwhile, Reiji, who is plotting an escape, is also after the tablet... Who stole it? The theft marks the beginning of the countdown to the prison break!

"I didn't kill my father." To Kozue Fuyuki (Ryoko Shinohara), a prison guard at Hikawa Detention Center, Kusaka Reiji (Jesse), who is suspected of murdering his father, claims his innocence. Detective Saeki Yusuke (Naohito Fujiki) says that the circumstantial evidence makes the possibility of his innocence extremely low, but... Meanwhile, Reiji approaches a cult that is plotting a prison break, asking them to join him... Soon after, a hostage situation breaks out inside the detention center! What is the motive behind the man (Ken Horiuchi) who demands a retrial in exchange for Kozue's life...?