Aggretsuko is an animated series created by Sanrio, featuring a red panda named Retsuko who works in an office. The show highlights her daily struggles with work stress, office politics, and her demanding boss, Director Ton. To cope with her frustrations, Retsuko often turns to death metal karaoke, where she expresses her emotions through powerful singing. The series combines humor and relatable themes, making it popular among viewers who appreciate its commentary on modern work life and personal challenges.