Specimen Number (Serial Number).In London, the ladies of Necessarius have trouble learning how to use a new washing machine. Back at Academy City, Mikoto finally claims her phone straps, while Tōma encounters Misaka 10032, who is searching for Last Order, and buys her a necklace so he can distinguish her from Mikoto. As Mikoto rejoins them, Misaka 10032 starts teasing her and clinging onto Tōma, attracting the attention of Last Order before Misaka 10032 chases after her again. Elsewhere, Hyōka Kazakiri appears from the Imaginary Number School District and is apprehended by the Anti-Skills. Accelerator heads to the underground mall to look for Last Order and ends up encountering Index, who decides to help search for Last Order after he treats her to a meal. Meanwhile, Last Order approaches Tōma to thank him for stopping the Level 6 Shift experiment, mentioning how she hopes to protect Accelerator. Tōma and Last Order soon part ways and join up with Index and Accelerator respectively, though Tōma and Accelerator do not actually see each other, and start making their ways home.