Toxic reaction found on the epidermis! Mast Cell does her job according to the manual, but complaints pour in from other cells that are annoyed by her actions. Mast Cell loses her cool and unleashes her rage... An incident occurs where an unknown entity breaks through a blood vessel and the blood cells get sucked away!

Ordinary Cell heads to the intestines with White Blood Cell (Neutrophil) to reunite the lactic acid bacteria with their friends, but they get separated from one of the bacteria on the way there. Ordinary Cell desperately searches for the lactic acid bacterium but is attacked by cells infected by a new virus!

The antibody information of a cell has leaked. There is tension in the air after NK Cell makes a comment to White Blood Cell (Neutrophil). The journey to reunite the lactic acid bacteria with their friends takes the group to the large intestine. In the intestine, which has been irritated due to toxic gas being released by harmful bacteria, the group meets up with Memory T Cell who was formerly known as "Killer T Cell."

The most formidable foe has returned... Cancer Cell has reappeared, and harmful bacteria are wreaking havoc in the intestinal environment. With the body being in unprecedented danger, White Blood Cell (Neutrophil) and his comrades fight a bloody war to protect the future of the world they live in.