Southern Cross Isle, a lush island located in the southern region of Japan, was home to Takuto Tsunashi after he swam there alone without any possessions. Upon enrolling in Southern Cross High School's senior level, Takuto quickly befriended various students, including Wako Agemaki and Sugata Shindou, thanks to his charming personality. However, beneath the island's serene exterior, Southern Cross High School hid a significant secret: colossal sleeping creatures named "Cybodies" that the island's inhabitants kept buried. This was just one of many secrets on the island, which included the mysterious activities of the Glittering Crux organization, the beautiful songs sung by shrine maidens, and a secret that Takuto would eventually uncover. Southern Cross Isle, with its tranquil seas and clear skies, set the stage for the "Eulogy of Youth", a story woven with love, aspirations, and camaraderie.