Rashomon and Tiger is the 12th chapter of Bungo Stray Dogs.
After making sure that Kyouka is safe, Atsushi and Akutagawa begin their fierce battle. It's revealed that Akutagawa was Dazai's former subordinate when he was in the Mafia, and that the reason why he hates Atsushi so much is because of his jealousy towards him when Dazai said he was a better subordinate than him. Ultimately, Atsushi wins the battle and sends Akutagawa flying into the sea. Atsushi and Kyouka are then rescued by Kunikida. Meanwhile, Dazai goes into the Mafia archives and is shocked when he discovers who put the bounty on Atsushi's head: a group of American ability users called The Guild, who is working with two other ability user groups called the Order of the Clock Tower, led by Agatha Christie, and the Rats in the House of the Dead, led by Fyodor Dostoyevsky. Since their plan failed, Francis Scott Key Fitzgerald, leader of The Guild, decides to head to Japan and capture the man-tiger before anyone else does.