Bakufu, the famous Ninja master, literally drops out of sky (hence the hole in the school's roof) and offers to teach at Shuriken School. The Principal doesn't dare refuse, but Bakufu's fee is exorbitant.

As the School prepares to celebrate the anniversary of the town's foundation, a mysterious Ninja from Katana School makes off with Tokiro's (the city's father) famous flip-flops. According to tradition, Shuriken presents these flip-flops to the public during the commemorative parade. If Shuriken School cannot produce them, the school's entire assets will be handed over to Katana School!

Laura and Sam, two private detectives who seem to have come straight out of a detective novel, want to follow a training course at Shuriken with the aim of improving their skills. They need to be able to arrest a gang of audacious thieves. The Principal lets them convince him with a thick bunch of bank notes that Laura offers him. However, it is out of the question that they be taught any secret ninja techniques, that must, as their name suggests, remain secret! Vlad immediately falls under the charm of the young detective. As for the students, they're captivated by Sam's stories!

The Principal is happy. A wealthy man is considering placing his son, Kazumi, in Shuriken School, along with a huge cheque, which would put an end to the school's financial dilemma. But first, the boy will spend a day at the School, to see if he likes it. Kazumi seems to appreciate Eizan, so the Principal puts him in charge of looking after the boy. But Kazumi is so spoiled rotten, that soon everyone avoids them (even Eizan's friends avoid him). The teachers themselves threaten to resign. Eizan feels miserable. When the Katana kids jump in and kidnap the boy, Eizan is faced with a choice. What if they just keep him? Well...perhaps not.

Great Master Otomo is visiting Shuriken School, and holds a conference about the ancient art of eating rice balls. The class is bored silly and the Principal watches Otomo gulp down one rice ball after the other with suspicion. When Otomo sees that neither class nor teachers are interested, he announces that a Great Philosopher living up in the mountain above the town handed on this precious knowledge, which has enabled the hermit-philosopher to live over 300 years! The students, impressed, clamour to meet him.

The Principal tells the students that an election for class leader will soon take place... no ordinary event, this happening is known as a Ninjalection. In this case, the most ingenious candidate gets the most votes... Thus begins a battle for votes between two candidates - on one side Ami (with Tetsuo and Yota in league as campaign managers), and on the other, Okuni, (supported by Eizan and Jimmy). The Principal keeps an eye on their adventures as the two girls vie with each other for vote. And the winner is... ?

Eizan rescues an adorable little chick from prowling tomcats while out walking with Jimmy and Okuni. Although pets are against Shuriken rules, Eizan decides to keep this one until he's fully recovered. Jimmy isn't happy about this, especially when the chick chooses his brand new shoes for a nest! Soon the entire class is in on the secret, but they all promise not to reveal anything... he's such a cute little bird!

Zumichito tells our three heroes the story of one of his epic adventures. At the time he was a young ninja and a Katana student stole the Jade Dragon from him, a priceless treasure that he was guarding. Just as he'd managed to get the treasure back off the thief - who had taken refuge on a boat on Lake Akayama - a huge monster of a fish attacked them. Zumi had no choice but to abandon the Dragon so as to save his adversary from drowning. Since that day, the treasure has lain at the bottom of the lake.

Kubo is in seventh heaven - Kabuki is getting closer, and for several years now, he has been the director. This year, he's decided to pull the roles out of a hat, and the main role ends up going to Eizan...to his great despair! When it comes to getting up on stage, Eizan falls to pieces, especially knowing half the town will come and watch the show! Rehearsals begin but the play is sabotaged by a mysterious ghost who turns the stage upside down!

This time the school is really falling to ruins. Old worn out material, broken floor boards...everyone is complaining to the Principal who finds himself having to search the internet for the cheapest solution to put things right - a kind of home automated computer called Alice...

As Eizan, Jimmy and Okuni are wandering through the shopping mall, a woman has her bag snatched. Our heroes chase after the thief, and, with Ami's help - who was in the middle of doing her shopping - they stop him in his tracks in a most spectacular way. When they take the bag back to the owner, Ami recognizes that it's the famous TV presenter from "Whiz Kids". The presenter is so impressed with their skills that she wants to film them at Shuriken to elect her "young genius" of martial arts for her next show!

To increase the school's income, the Principal has accepted to house three young stars from the music industry in need of calm and tranquillity. The atmosphere at Shuriken is morose. The stars snub their hosts, their manager is unbearable, and the gym is out of bounds for the budding ninjas. Outside, fans, photographers and TV production vans have flocked in, as if by miracle. Shuriken resembles a besieged fort. The Principal announces to Eizan, Okuni and Jimmy that they are about to carry out their first true ninja mission...

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Something's gone terribly wrong with Eizan's father's rice ball business. All the costumers are complaining about the rice balls. They taste like dirt. It's awful. Business is falling off in landslide proportion. And Eizan soon discovers that the only thing worse than all those rice balls is no rice balls! With the rice ball business going bankrupt, Eizan's family is going to have to move and go back to the family farm on a distant island ... which means Eizan will have to move with them! Which means no more Shuriken School for Eizan!!!