This sound is from Haven’t You Heard? I’m Sakamoto Soundboard

"I'm Sakamoto, You Know?" is a Japanese manga series written and illustrated by Nami Sano. The series has been licensed for an English release by Seven Seas Entertainment. An anime television adaptation produced by Studio Deen aired between April 8 and July 5, 2016. The series was licensed for a English release.
See also: Hikaru Midorikawa, Studio Deen, Adam Gibbs, Nami Sano, Sakamoto, and Harta (magazine).