When Kenichi watches TV, Ninja Hattori enters and surprises Kenichi. Hattori does all the household work and surprises Kenichi and his family; Koike-Sensei gets afraid of Hattori's shadow and runs to school. He scolds Kenichi at school, but Hattori saves Kenichi; Kenichi finds out ways to earn money to buy a toy engine for him. Hattori takes up a job and surprises Kenichi with a toy engine.