Who Saw the Peacock Dance in the Jungle?

Collegiate Komugi Yamashita lives with her retired policeman father, having lost her mother early on. But then her father is murdered, leaving only a letter cryptically naming a certain person as innocent should he ever be arrested or prosecuted. Learning the suspect is the son of a criminal executed 22 years ago, Komugi seeks the help of a lawyer Matsukaze named in the letter. But Matsukaze has never had any contact with Komugi's father. So the two go in search of the shocking truth.