This ONA is a short web movie made in collaboration with Otsuka Pharmaceutical and its Pocari Sweat brand. It takes episode 11 of Cells at Work! and adds fresh animation and new dialogue, reshaping the episode around hyperthermia and heat stroke. The goal is to help viewers understand the condition and why it pays to act early, a response to the record number of emergency hospital transports for heat stroke in the summer of 2018. Part public health message and part comedy, the special was released on Otsuka Pharmaceutical's YouTube channel.