Wataru Minakami is a top student who failed his high school entrance exam because of a computer glitch. He later discovered that he was accepted to Stargazer Hill Academy, which is located at a mysterious place called Promised Island. At the request of his father, Wataru is whisked away to the island, and before he can settle in, a dozen of cute and charming girls start to flock him and claim to be his younger sisters. As Wataru gets closer to his newfound siblings, a deeper mystery as to why they were sent to the island comes to play. (Source: ANN)

Dr. Hell and his Mechanical Beasts are back, and they're more dangerous than ever before. Kouji Kabuto and Tetsuya Tsurugi fight a fierce battle against these hellish machines, which are under the command of Baron Ashura. Unfortunately, they are defeated, with Kouji's Mazinger Z being captured and Tetsuya's Great Mazinger seriously damaged by the enemy. The devious Dr. Hell quickly converts the captured robot into Ashura Mazinger and uses it to attack the Photo Power Lab. At the same time, Kouji is missing in action, which leaves Testuya to defend the lab in the damaged Great Mazinger. But the forces of Dr. Hell are too strong, even for a brave pilot such as Tetsuya, and all seems to be lost. The battle seems to be drawing to a close, until an overpowering blast fired by an unknown robot destroys the entire Mechanical Beast army. Could this mysterious robot be the legendary Mazinkaiser, and who is piloting it?

Chinami Ebihara is girl with a strange ability to generate electromagnetic waves when her emotions run high. However, since this "ability" affects anything electrical, it resulted in her having to transfer from school to school when she was younger. As Chinami, now 18 years of age, transfers to a new school, she once again affects the electronic devices in the school, but this time, when another student, Kotaro Kannagi, sees her do this, he becomes obsessed in studying her "TYPE-E" ability.

At a CD store, Ichika Hoshino hears a song by Miku that she has never heard before. On the monitor, she sees a "Hatsune Miku" in a form she has never seen before, and couldn't help say it out loud, "Miku!?" Miku was surprised at the voice, her eyes meet Ichika's, but she disappears shortly after. Later, after a live performance on the street, the Miku that Ichika saw before appears on her smartphone. Miku looks sad and downcast, and when Ichika quietly asks Miku about her story, she tells Ichika that there are people to whom she wants to deliver her songs, but no matter how much she sings, her songs are not reaching them. Miku, who saw Ichika singing to the hearts of many people at her live performances, thought that if she learns more about Ichika, she can do the same, and came to Ichika. Ichika smiles at Miku and says, "If it's all right with me." And a new story of Hatsune Miku and the boys and girls begins—.