The tag alias #78899 zaako -> zako is pending approval.

Reason: Misspelled Japanese word 'Zako', meaning 'small fish', or slang for loser

Zako is a song by Hiiragi Magnetite, and the animation has developed into a trend/meme.
Spotify upload with the proper spelling: https://open.spotify.com/track/3Ml7kBYjc9t5IHDIOZz5Of