tto Māchi, Ribbit March) by Nobuaki Kakuda & Juri Ihata is used as the opening from episode 1 to 51.

He is instead kept as a pet and forced to do chores for the Hinata family, which consists of paranormal maniac Fuyuki, his ill-tempered older sister Natsumi, and their manga-editing mother Aki.

Momoka tries to confess her feelings for Fuyuki but is interrupted when Tamama farts while hidden inside her schoolbag.

": Giroro is disgusted by Keroro and Tamama's lack of progress in the invasion and decides to set traps for the Hinatas using all the information he had gathered on them.

He immobilizes both Keroro and Fuyuki, but Natsumi easily overcomes the traps with her brute strength and knocks out Giroro.

Angol Mois falls over the Hinata's house and reveals that she not only knows Keroro but she's here to fulfill the prophecy of the Earth's destruction.

A battle between Keronians, humans and Mois starts for the control of the Lucifer Spear that would grant the destruction, conquer or safety of the planet.

Keroro remembers yet again that he should be invading Pekopon so he convinces the Hinatas to do something outdoors while he and his platoon work in constructing a secret base.

Things are getting difficult for Keroro who realizes that the invasion needs someone intelligent so he orders to find the fourth frog Kululu.

Fuyuki thinks it’s because Saburo is an agent hunting aliens, but in fact it’s because he found Kululu and it was time to reunite him with the Platoon.

Kururu uses an invention to shrink Giroro and Tamama, and they go inside Keroro's mouth to beat the cavitians.

Space idol Sumomo arrives at the Hinata's house to offer a private concert for the troops in Pekopon.

In the end, after passing an afternoon as an unknown human, she realizes that she misses that attention and abandons Keroro leaving him with a huge debt from the concert planning.

Both things are related as the new girl Koyuki is a ninja protecting Earth who also found the last frog, Zeroro.

Keroro works hard to come up with a plan to invade Pekopon but Dororo keeps refusing all of them for not being ecologically friendly.

Dororo, Saburo and Tamama find Mois beating up people and head to the Hinata's house to investigate.

Keroro plans a trip to the school pool to test how good swimsuits actually stand against a Keronians.

Keroro then reveals that the reason why they had to go there is a comedy stand contest which prize is a mountain of fake but very rare Gundam knock off models and he wants Mois and Natsumi to win them.

Fuyuki meets a girl and both clean the beach until Keroro calls him to dive to the deeps of the sea to help him with a school research.

Space Detective Kogoro and his sister Lavie land in Pekopon and confuse Natsumi with random comments.

Keroro wants to film the platoon taking down the Nishizawa's army so headquarters would think he is competent.

Private Taruru lands on Pekopon, and thinks Tamama is the sarge, due to some lies on Twitter.

After Fuyuki refuses to take him to the toy store, Keroro decides to get his revenge by putting them into a simulator that produces ice cold temperatures.

When Keroro finds himself in debt, he decides to open a ninja training school, with Dororo as the teacher.

Since nobody shows up, Keroro decides to have Dororo teach the platoon the ways of the ninja, however they struggle to pay attention.