The story centers on the Blue Cat-led Health Special Attack Team. During an accident, when Princess Lala of Ozma chased the virus Guli to Earth, her spaceship unexpectedly crashed, causing a large-scale leak of alien viruses. Virus Guli also found a host: Tuan Tuan. To save Tuan Tuan's life and prevent the virus from mutating, the Health Special Attack Team ventures deep into Tuan Tuan's body, engaging in a desperate battle against Virus Guli. However, within Tuan Tuan's body, what awaits them is even more unknown dangers and crises.