The Platelets Go to the Movie Theater

An anime short screened along with the Hataraku Saibou!!: Saikyou no Teki, Futatabi. Karada no Naka wa "Chou" Oosawagi! (Cells at Work!! The Return of the Strongest Enemy. A Huge Uproar in the Body’s Bowels!) theatrical anime.(Source: ANN)