In Durarara!! , Episode 9—titled —is a pivotal moment where the series begins to tie its many disparate plot threads together. Narrated by Namie Yagiri, it reveals the dark origins of the Yagiri family and the mysterious "head". Key Plot Points
Amidst the chaos, the girl escapes and runs into Mikado Ryuugamine , who hides her in his apartment to protect her from Celty. Notable Adaptations & Differences Durarara!! Episode 9
It is revealed that Mika Harima , who had been stalking Seiji, discovered the head in his apartment. In a fit of rage and obsession, Seiji killed her. Namie later had the head (supposedly) surgically attached to Mika’s body. In Durarara