Mikado Ryuugamine visits Shinra Kishitani's apartment one night, expecting a quiet conversation with Celty after a long absence. To his surprise, he walks into a bustling hot pot party attended by Ikebukuro's finest. Amidst the chaos, Mikado finds his schoolmate Anri Sonohara joining the gathering. As they settle in together, the group shares nostalgic tales: Mikado reminisces about childhood escapades with Masaomi Kida, Anri recounts how her friendship with Mika Harima blossomed, and Shizuo Heiwajima recounts his initial encounter with Tom Tanaka.