Himitsu: The Top Secret Episode 6

A waxy corpse is discovered in an old apartment complex and is sent to the First Forensic Laboratory. The corpse has not been mummified and is still intact, and Yukiko believes it was buried around 20 to 25 years ago. Due to the brutality of the wounds on the corpse, Yukiko tells Maki that the Ninth should investigate, but he refuses. Aoki decides to investigate it alone. Meanwhile, Yukiko receives a wedding invitation from her friend, Hamada Aoi, who she hasn't seen in a long time. She learns that Aoi is living with her fiancé Hayase and her brother Hisashi, who doesn't like her fiancé. Maki suddenly appears and points out that Aoi is hiding something... (Source: Japanese = ktv.jp || Translation = mikilove13 at MyDramaList)