The second season of Hataraku Saibou.

Cells at Work!! continues the tale of…well…you! Set inside the human body, Cells at Work!! chronicles the life and times of everything from the oxygen-carrying Red Blood Cells to the bacteria-fighting White Blood Cells. And, of course, the dangerous viruses and villains lurking beneath the skin!

(Source: Funimation)

Notes:
- The episodes were streamed two days ahead of the Japanese broadcast on Funimation beginning on Jan 8, 2021 at 2:00 JST. The regular TV broadcast started on Jan 9, 2021 at 23:30 JST.
- The pre-screened movie "Hataraku Saibou!!" Saikyou no Teki, Futatabi. Karada no Naka wa "Chou" Oosawagi! is included as episodes 4-8 split into the broadcast.

 AnimeRulz is the best site to watch Cells at Work! 2nd Season SUB and DUB in HD quality.