Aggretsuko was created by “Yeti” as a mascot for Sanrio. The character first appeared in a series of animated shorts by Fanworks which aired on Tokyo Broadcasting System Television between April 2016 and March 2018.
Retsuko is a 25-year old red panda who works in her dream company’s accounting department. But it turns out that she is forced to keep doing more and more impossible tasks by her superiors and co-workers. She doesn’t talk back to them, but she still has to let off steam, so she ends up going to karaoke by herself and singing death metal.