Episode 4
Ryuichi is in high school now. He takes the daycare gang around to see the school's clubs, which are recruiting. He also tries to get people to join the babysitter club, but it doesn't seem to be going very well... Later, Ryuichi gets sick, and has to stay in bed. On the chairwoman's instruction, Kotaro works hard to try to make Ryuichi a special drink that will make him better.
Aired 28/01/2018EP 4 - Episode 4
School Babysitters
The manga centers on the brothers Ryuuichi and Kotarou Kashima. Ryuuichi is in high school and Kotarou is still a toddler. After their parents are killed in a plane crash, the two brothers find themselves living with the chairwoman of the Morinomiya Academy, who herself lost her son and daughter-in-law in the same accident. The chairwoman, however, has one stipulation for the brothers in order to live with her: Ryuuichi has to work at the academy's daycare center as a babysitter.
(Source: Anime News Network)