TV ANIME: Hidan no Aria AA [BGM: Takuro Iga]

ORIGINAL TITLE: 緋弾のアリアAA [Hidan no Aria AA / Aria the Scarlet Ammo Double A]

BGM: 伊賀拓郎 [Takuro Iga]

JAPANESE WIKIPEDIA LINK

SYNOPSIS

Akari Mamiya is a freshman and E-rank student who looks up to her upperclassman, the S-ranked Aria H. Kanzaki. They both attend Tokyo Butei High School, which employs the “Amica” system, allowing an underclassman to train alongside an upperclassman. Akari is determined to be paired with Aria.

(Source: ANN)