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)

Koutarou Nishiyamaas Ryuuichi Kashima
Nozomi Furukias Kotarou Kashima
Yuuichirou Umeharaas Hayato Kamitani
Yuuko Sanpeias Taka Kamitani
Tomoko Miyaderaas Youko Morinomiya
Daisuke Onoas Keigo Saikawa
Tomoaki Maenoas Yoshihito Usaida
Satomi Akesakaas Maria Inomata
Toshiyuki Someyaas Tomoya Yagi
Yoshimasa Hosoyaas Hiroyuki Inui