Butterfly Knife(2023)

Butterfly Knife is a Japanese thriller series centered on a brutal crime and its aftermath. When a single mother is murdered in her apartment, her son Kazuki Saito vanishes, leaving police and the public scrambling for answers. Media coverage of similar killings fuels speculation about a serial killer's identity and methods. As investigators close in, a girl named Sayo stumbles into the woods and encounters a man matching the suspected killer's description—armed with a knife. The series unfolds the dangerous intersection of these lives, exploring whether Sayo's meeting with this figure will lead to her salvation or doom, while the truth behind the murders remains elusive.