Pediatrician Makino (Matsushita Gohei) was sent to Higashi Tama No. 8 Elementary School as “school nurse”.The children and Shinoya (Aoi Morikawa), the homeroom teacher of Class 2, sixth grade, were all angry at Makino's words: "Try not to come to the health room".Makino is a pilot doctor selected by the university hospital to conduct the school's resident experiment, but he seems to have another hidden secret...

On this day, as usual, the child king Takuma (Tonggo) discovered that there was a cool secret base in the restricted area of ​​​​the back mountain, so he invited the interested Hiroya (Yoshida Sosuke) and Yamato (Yamaguchi Noto) to go with him.Takuma, who was already ill, suddenly collapsed in the grass... Makino, who went to the scene with Shinoya, saw Takuma's symptoms and immediately judged that he had some kind of disease.

A few days later, Shinoya consulted Makino about the sleepy Yuki (Risa Masuda), and admitted that it was difficult for him to understand the child's thoughts. As a result, the two got into a quarrel.At this time, someone told them that Yuki had fainted on the playground...