Aggretsuko is a oNA (web) anime that premiered in spring 2018, produced by Fanworks.

About the production: the story comes from an original script, there are 10 episodes of about 15 minutes and its current status is "finished".

Its main genres are comedy, music and slice of life, with themes such as Work, Office Lady, Metal Music and Anthropomorphism.

On AniList, Aggretsuko has an average score of 74%, a good score, and appears on 63,371 users' lists.

The franchise continues in or follows from: Aggressive Retsuko Season 2.

Some offices have stereotypical dynamics: the chauvinistic pig of a boss who never does any real work; the employees whose goal is to suck up to the boss; the ones whose lives seem perfect; and the individuals who have all the actual work pushed onto them. Retsuko the red panda is in the last group, as she stays late most nights to make up the work her coworkers are too lazy to do themselves. Her relief from the stress of her everyday life comes in the form of singing death metal at a local karaoke club. Night after night, Retsuko channels her grief into a microphone and considers the place to be her own personal sanctuary. But as she moves further away from her comfort zone and the ideas people have of her, she discovers that letting others into her world of death metal may not be such a bad thing.

Official synopsis from AniList.