Akiko Yosano, Kenji Miyazawa, and Jun'ichirō Tanizaki vs. Port Mafia

Akiko Yosano, Kenji Miyazawa, and Jun'ichirō Tanizaki vs. Port Mafia is a battle fought between the Armed Detective Agency members Akiko Yosano, Kenji Miyazawa, and Jun'ichirō Tanizaki and Port Mafia later to be interrupted by Motojirō Kajii's appearance.

It happened at Port Mafia's base ground floor after the agency decided to take on the mafia in order to save Yukichi Fukuzawa from the cannibalism virus.

Prologue
Shortly after the agency members have gathered again and failing to catch the virus ability user, Ranpo decides to stage a frontal asault. He further states that they cannot overturn the enemy's traps and lets the agency members to decide whether to join or not with their fight with the mafia. Ranpo estimates that once the mafia knows Fukuzawa's location in the safe space, they will resort to terrorism. Tanizaki, Kenji, and Yosano are among those who decided to join the fight. They then set off to fight the mafia.

Battle
The Port Mafia shoots at Kenji but is unaffected by the bullets. He proceeds to lift up the ground causing the guards to fall down. The three then charges forward and manages to broke in at the ground floor.

They are continuously pinned down by a rain of bullets upon infiltration. Suddenly the bullets stop and they find Motojirō strapped with bombs. Motojirō soon declares his experiment called the "Lemon Runway" and proceeds to release bombs. It causes a huge explosion that made Yosano decide for them to pull back.

Aftermath
The three head back together at the agency office. Yosano is seen threating Kyōka after his battle with Akutagawa.

Manga and Anime Differences

 * Tanizaki wears his jacket during the fight. Unlike in the anime where he wraps it around his waist.
 * In the anime, they are hiding behind an extracted ground caused by Kenji. In the manga, they are hiding behind a wall.