Yumaka Manabu (Nagase Tomoya) was a solitary cartoonist and was assistant of Kazami Yui (Fujitani Miwako) who had three Batsuiti children, but he got married to her and eventually married. However, suddenly Yui left this world in a traffic accident, decided to become the father of the remaining children Kaoruko (Goto Maki), Sakurako (Ishida Mirai), Junnosuke (Kazuna Kuniwa).