Following the death of Warz Gill at the hands of the Gokaigers, the Zangyack have increased the bounties of the space pirates — with Captain Marvelous' head set to an "Unlimited Reward" which means that anyone can name their own price. Aboard the Gokai Galleon, Navi's latest navigation fortune involves Moroboshi High School, which Gai immediately identifies as the school where the Megarangers attended. Though Gai explains that the Megarangers have long graduated from Moroboshi High, the Gokai Galleon crew decides to investigate nonetheless. Upon arriving at the high school, the crew meets Kenta Date, the former Mega Red who is now a teacher at the school. Overhearing them talking about school, Kenta tells the Gokai Galleon crew that in order to obtain his team's Great Power, they must become students for the day. Though only Ahim and Gai look forward to this venture, the others begin to open up and enjoy high school life while developing a connection with the students who are moving toward their dreams. Having been watching them from afar, Kenta sees Sally on the campus and follows the monkey into the forest. Gai, suspecting something is up, follows him. Kenta searches for Sally when he is confronted by Basco who has come to steal the Great Power of the Megarangers. Gai shows up to protect Kenta just as Basco reveals that he has planted multiple time bombs in Moroboshi High which will go off in 10 minutes unless Kenta surrenders the Great Power to him. Having overheard the conversation over the Gokai Cellular, Captain Marvelous tells Kenta not give in to the privateer's demands. While Gokai Silver changes into Magi Shine to protect Kenta from Sally, the rest of the Gokaigers are aided by Kenta's Digiken students in locating the bombs all over the school with the other students' help. However, Basco defeats Gokai Silver before he proceeds to take the Great Power from Kenta. Gokai Silver uses the Gosei Knight Key to use a Defense Gosei Card against the attack before the other Gokaigers arrive on the scene, revealing that they used the Timeranger Keys to freeze-compress the bombs. As Kenta returns to the school, the Gokaigers change into the Megarangers. Gokai Red and Silver take on Basco, while the others fight Sally. When the Gokaigers attempt to destroy the damaged Sally, Basco blocks the Gokai Supernova and Slash attack before unleashing the Pseudo-Lifeforms Woodroid Moririn and Soilroid Dororin from the space monkey's body and carrying his pet to safety. After using Magi Gokaioh and Fuuraimaru to weaken Dororin and Moririn, they form Kanzen Gokaioh to destroy the two Pseudo-Lifeforms. As the day comes to an end, Kenta fulfills his end of the deal by giving the Great Power of the Megarangers to the Gokai Galleon crew as their "diplomas". The pirates then take their leave as Gai tries to talk them into sticking around for dinner with Kenta.