


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 wants a model locomotive. He tries to save money by helping out at home, but Hattori finishes his errands before Kenichi. Hattori-kun is kicked out by Kenichi who gets angry, but he starts a part-time job at a soba restaurant for Kenichi.
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.
Hattori trains Kenichi to play baseball. But as Kenichi fears to play the match, Hattori plays on his behalf. Later, Kennichi plays and wins the match.
Amara meets Hattori and fights with him. So, Hattori decides to teach Amara a lesson, but Koike-Sensei scolds Kenichi.
Shinzou finds Hattori and helps him get rid of Amara. Hattori introduces Shinzou to Kenichi's family.
Koike-Sensei visits Kenichi's house. Shishimaru loses his grip and falls on Koike-Sensei and gets him unconscious.
Shinzou loses his way and the list. So, Shishimaru and Hattori guide him. Shinzou tells everyone about his deed.
Yamamoto visits Kentaru as a schoolmate. In the night, Yamamoto robs and tries to leave but gets caught. A cop declares a reward to the family.
Kenichi takes Hattori and Shinzou's help and wins the race on sports day.
Hattori and Kenichi click pictures of Kemumaki's cat while he robs the fruits and proves Kenichi innocent to the neighbour.
Kenichi gets a bad dream of Kemumaki threatening him and gets afraid to go to school. On seeing the doctor, Kenichi reveals the truth and makes Kemumaki his friend.
Kenichi impresses with his picture of a UFO. After returning home, Hattori tells Kenichi the truth about the UFO.
Kenichi insists Hattori on teaching him the Ninja technique and misuses it. Kenichi promises Hattori to use the technique at the right time.
Kenichi enjoys his day and forgets to complete his homework. Next morning, he is surprised to see his homework completed by Hattori.
Kenichi assumes Shinzou has been kidnapped. After a lot of struggle, Hattori and Kenichi are shocked to find Shinzou with Koike-Sensei.
Kenichi takes training from Shishimaru and acts just as Shishimaru teaches him. The audience has a hearty laugh watching the talent show.
Kenichi and his friends visit the cocoa garden. While plucking the fruits, they get caught by the manager, but he allows them to take fruits.
On hearing Shinzou's cry, Hattori shows the family a room that he uses to meditate at night.
The Mitsuba family visit the zoo. Shishimaru shows his ninja techniques to the lions as he wishes to be like them.
Kaiko Sir announces students to sketch in autumn. Hattori takes a goat's look and eats Kemumaki and Kenichi's drawing paper and saves them from feeling ashamed before the teacher.