The adventures inside the inner workings of the human body will return in Cells at Work! season 2 in January 2021, it was announced during Aniplex's Abema TV live stream on March 21. Before that though, a special theatrically special titled 'Tokubetsu Joei-ban "Hataraku Saibo!!" Saikyo no Teki, Futatabi. Karada no Naka wa "Cho" Osawagi!' will be released on September 5 based on a story from the 5th volume of Akane Shimizu's manga series that will also be seen in the second season. 

Tew new trailer and visual was released to help get your red-blood cells excited for the upcoming season.

Second season trailer:

Theatrical special trailer:

Hirofumi Ogura (Black Bulter II) replaces Kenichi Suzuki as the director on the series at David Production, with the rest of the staff and cast from the first season returning for the second season (and theatrical special). 

The first season of Cells at Work! from July 8 to September 30, 2018 and was streamed on Crunchyroll as it aired. Crunchyroll describes the series as such:

This is a story about you. A tale about the inside of your body… According to a new study, the human body consists of approximately 37 trillion cells. These cells are hard at work every day within a world that is your body. From the oxygen carrying Red Blood Cells to the bacteria fighting White Blood Cells, Get to know the unsung heroes and the drama that unfolds inside of you!

Source: Cells at Work! on Twitter

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Daryl Harding is a Japan Correspondent for Crunchyroll News. He also runs the YouTube channel about Japan stuff called TheDoctorDazza, tweets at @DoctorDazza and posts photos of his travels on Instagram.