Hideaki and Misuzu are the parents of 3 year old boy　Haruto. From the parents point of view, Haruto always shows interest in unexpected things and reacts strangely.
The couple is frustrated, as Haruto seems very restless, and do unwanted things, creating trouble everywhere, and they cannot take their eyes off him, but always apologizing to everyone. The couple is always wondering how can Haruto behave and how can they bring about his potential talent.
The couple seeks advise from their mother, parents who have children of same age, and learns characteristics of growing boy and how should they approach him through different growth stages. Little by little, their patience pays off and begin to enjoy Haruto’s growth together.