第 10 集: 紅血球在逃離金黃色葡萄球菌時，遇見了一名戴著面具的單核球。
2018年9月9日 播出
Red Blood Cell is being chased by a germ! The one to come to the rescue is a masked monocyte. Apparently, they are also part of the White Blood Cell family and a type of immune cell. There’s no way Red Blood Cell could be attacked by bacteria twice in one day, but she encounters another one on her way to the nasal cavity. The germ turns out to be staphylococcus aureus. They usually just exist on the skin and pores. But this time, they claim to have be invisible with a secret plan. What could it be!? (Source: Aniplex USA)