BEAT IN (Biri)! BEAT IN (Biri)!

BEAT IN (Biri)! BEAT IN (Biri)! (BEAT IN(ビリ)！BEAT IN(ビリ)！) is Misaka Mikoto's image song sung by Mikoto's Japanese voice actress Rina Satō.

It appears as the second track on the Toaru Majutsu no Index II Archives 3, and was released on July 27, 2011.