Cells at Work!: The Common Cold
A comedy series that brings humor and levity to its premise.
For the regular cells of the human body, life consists of countless repetitive tasks. They spend every day multiplying, leaving little time for other activities. But one day, this monotony is abruptly interrupted by a cell with an odd-looking hat. Tired of unending drudgery, another cell named Ippan Saibou decides to join this quirky stranger for a day of pranks, jokes, and mischief.
Plot summary from MyAnimeList. Data and images via Jikan API.