Season 4 is the fourth season of Aggretsuko.
It was announced to be in production with a tweet by Netflix's NX Twitter account on December 23, 2020.
While a release date was not included with the announcement of the fourth season entering production, the show's writer and director - Rarecho - expressed a desire to produce another season shortly after the release of the third season in August 2020.
He is likely to return in some capacity for the fourth season, after commenting he felt the Netflix series wrapped up at the end of third season, and made similar comments following the release of second season.
- Tweet: @NXOnNetflix "Retsy Claus has a present for all you metalheads out there! @aggretsuko is coming back for a fourth season of romance, rock, and RAGE!". Available at: https://twitter.com/NXOnNetflix/status/1341896371683667968
- Tweet: @rarecho1 "4期やりたいなー。できるかどうかは皆さんの応援にかかってるんじゃないかと思ってます。頑張ります。" ("I want to do 4 terms. I think it depends on everyone's support whether or not it can be done. I will do my best."). Available at: https://twitter.com/rarecho1/status/1300343121214017536.
- Tweet: @rarecho1 "第三シーズンで終わったと思ってたアグレッシブ烈子の続編の制作が決定して、嬉しさとプレッシャーで死にそうです。メリークリスマス！" ("The sequel to Retsuko Aggressive, which I thought was over in the third season, was decided to be produced, and I'm about to die with joy and pressure. Merry Christmas!". Available at: https://twitter.com/rarecho1/status/1342019631146360834