BEAST Jun'ichirō Tanizaki/Synopsis

Plot
Tanizaki poses as a bomber holding a hostage inside the detective agency. He threatens to detonate the bombs and Akutagawa tells him to do it, acting on his threat, the bomber pushes the button. He was then pinned on the wall by Akutagawa after destroying the bomb. Later that day, he apologizes to Akutagawa and introduces themselves as Jun'ichirō Tanizaki and the hostage, his sister Naomi. Tanizaki and Kunikida have a mental conversation, thinking Akutagawa seems angry with Tanizaki as he is looking at him angrily. Tanizaki is asked by Akutagawa if Naomi is really his sister to which he confirms it. While at the cafe, it's up to Tanizaki and Kunikida to asses whether or not Akutagawa is truly able to take on the job since he has only been preliminarily accepted.

When Oda arrives at the cafe, he proceeds to properly introduce Oda to Akutagawa. He is later seen with the other agency members when they approach Ranpo to ask for his help in finding Akutagawa's sister. After hearing Ranpo's condition on the stamp approval given to Akutagawa, Tanizaki then proceeds to stamp the card and tells Akutagawa that if he is in his position, he wouldn't be able to wait long enough to complete the card and gives him advice that if he sees the man in black, don't go easy on him.

He is later seen together with Kunikida and Oda at the Port Mafia at the pharmaceutical building, stopping AKutagawa to further kill its employees due to the crim they committed - dumping illegal waste on the fields. While Kunikida tries to find Akutagawa for him to work, Tanizaki points out Akutagawa's whereabouts under the desk, saying that he is hiding from Yosano-sensei since her condition is for Akutagawa to be healed 40 times.

After some time, he is at the conference room together with other agency members, being briefly discussed by Kunikida about Dazai and Special Division for Unusual Powers Taneda's secretly recorded meeting. Tanizaki reveals that it was Oda who got the video, together with Ranpo's ability, the two of them infiltrated the institution that took them three days. After seeing the video and confirming that the person talking is the "man in black" Akutagawa is referring, he storms out of the room and vows to kill him. However, Tanizaki stops him saying that it will be dangerous for him to go alone at the Port Mafia base. However, Akutagawa ignores him and proceeds to leave the room.

Tanizaki appears to Akutagawa's aid in the Port Mafia base- using his ability, he successfully gets hold of Kyōka's phone. Together with Akutagawa, they sneak past the guards in order to hide from them. After successully escaping, Tanizaki is asked by Akutagawa the reason of him helping him. He responds that it is because he is a member of the Armed Detective Agency and that they are both similar bt only have one differece, which is Akutagawa shouldn't be left alone who is risking his life to find his dying sister. Tanizaki reveals that the letter Akutagawa received at the cafe contains the date and time of her execution and it's only one hour from then. Tanizaki reveals that the president orders all the agency members to stop their activities and help with Gin's rescue operation