The Mole Song: Undercover Agent Reiji
is a 2013 Japanese film directed by Takashi Miike based on the manga series Mogura no Uta. It was released in Japan on February 15, 2014. A sequel, The Mole Song: Hong Kong Capriccio was released on December 23, 2016. Plot Reiji Kikukawa is officially fired from active police duty for gross misconduct after numerous complaints but his strong sense of morality leads his superior to secretly dispatch him as an undercover agent to infiltrate the Sukiya-kai, a ruthless yakuza gang, and arrest its fourth-generation boss Shuho Todoroki. He is instructed in how to work undercover by Special Agent Kazumi Akagiri and sent to an illegal casino run by the Akogi-gumi, an arm of the Sukiya-kai. He intentionally gets caught cheating in order to meet the boss Masaya Hiura, a.k.a. "Crazy Papillon", who is impressed by his humor and exchanges vows of brotherhood with him, bringing him into the Sukiya-kai. Kazumi informs Reiji that he is sure that the Sukiya-kai makes its money from selling MDMA but he cannot connect the street dealers to the yakuza. Reiji asks Hiura if the Akogi-gumi is clean and Hiura explains that his father Masayoshii Ako says that "drugs are the root of all evil." Junna, another policewoman on the force, is upset that Reiji is not responding to her texts and angrily texts that she will not pop his cherry if he does not respond soon. Kazumi sends her to a brothel called True Love in Kabukichō, where she and her fellow policewoman are recruited as escorts. Junna encounters Reiji at the brothel and is upset that he has decided to join the yakuza, unaware that he is a mole. Aiko, fifth-generation boss of Hachinosu-kai, the biggest yakuza clan in Kansai, wishes to take over Kanto and sends Issei Nekozawa, No. 3 of the Chibiki Family, to spark a conflict between the peacefully coexisting clans. Nekozawa attempts to rape Junna at the brothel but Reiji fights him and his men off. Hiura takes over the brothel as a new revenue source for their clan and rewards Reiji by introducing him to his father Masayoshi Ako. At the meeting Reiji drops a pill of MDMA and it is picked up by Kenta Kurokawa. Reiji meets Kenta later to become partners in the drug business run by Ako and Kenta that is secret from everyone else in the Akogi-gumi and the two make a pact through a game of Russian roulette. Reiji informs Kazumi of this by phone but then he is captured by Kuroken, a yakuza biker with a full-body leopard tattoo, and taken to Nekozawa, who has shot his own men and plans to blame it on Reiji. Aiko calls and tells Nekozawa and told that Reiji has not yet taken part in the sakazuki ritual and therefore is not yet a member of the Sukiya-kai. Nekozawa vows to start the clan war as soon as Reiji takes part in the sakazuki ritual. The biker finds Hiura on the road and attempts to