Satomi Satoshi (played by Matsuzaka Tori) and his senior partner Inokuma Yuki (played by Kimura Fumino) are a couple who are married, but they can only date secretly without telling their peers because they will be transferred if they make their relationship public. One day, two female bodies were found. According to the testimony of eyewitnesses at the scene, a beautiful woman with a mysterious and dangerous aura appeared in front of them. This person is called Tachibana Kana (played by Nanao), whose beautiful face is breathtaking, and the ominous aura that accompanies her makes people shudder. In contrast, Kana seems to have a different feeling for Inokuma, and she is involved in various cases, which makes Satomi and Inokuma unknowingly step into a terrible trap... This film is adapted from the original manga "Siren" by Yamazaki Sayaka.