1981
Shishimaru (Ninja dog) helps Kenichi and Yumeko from a dog and disappears. So, Hattori catches Shishimaru and brings him home; Hattori makes Kenichi study hard and does not allow him to rest. As Kenichi scores good marks, Ama gifts them both; Kenichi takes Hattori's help and does all the household work. Kenichi surprises his parents on their wedding anniversary with a celebration.
1981
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.