Thirty-six students find themselves and their school building suddenly adrift in a void-like dimension. When supernatural powers awaken in some of them, a sense of detachment begins to divide the group. Despite the student council's attempts to impose order, they clash with the students possessing special abilities, who rebel against their strict control. This conflict leads them to discover that this world has its own set of rules—and following them is necessary for survival. After one of the students decides to take a leap of faith, the school switches dimensions once again. While they deal with the unique challenges and circumstances that each world presents, the students must unravel the mysterious phenomenon and find a way back home.

Filled with an overwhelming sense of wonder for the world around her, Mari Tamaki has always dreamt of what lies beyond the reaches of the universe. However, despite harboring such large aspirations on the inside, her fear of the unknown and anxiety over her own possible limitations have always held her back from chasing them. But now, in her second year of high school, Mari is more determined than ever to not let any more of her youth go to waste. Still, her fear continues to prevent her from taking that ambitious step forward—that is, until she has a chance encounter with a girl who has grand dreams of her own. Spurred by her mother's disappearance, Shirase Kobuchizawa has been working hard to fund her trip to Antarctica. Despite facing doubt and ridicule from virtually everyone, Shirase is determined to embark on this expedition to search for her mother in a place further than the universe itself. Inspired by Shirase's resolve, Mari jumps at the chance to join her. Soon, their efforts attract the attention of the bubbly Hinata Miyake, who is eager to stand out, and Yuzuki Shiraishi, a polite girl from a high class background. Together, the four spirited girls set sail toward the frozen south, all in search of something great.

Souten Kouro's story is based loosely on the events taking place in Three Kingdoms period of China during the life of the last Chancellor of the Eastern Han Dynasty, Cao Cao (155 – March 15, 220), who also serves as the main character. The Three Kingdoms period has been a popular theme in Japanese manga for decades, but Souten Kouro differs greatly from most of the others on several points. One significant difference is its highly positive portrayal of its main character, Cao Cao, who is traditionally the antagonist in not only Japanese manga, but also most novel versions of the Three Kingdoms period, including the original 14th century version, Romance of the Three Kingdoms by Luo Guanzhong. Another significant difference from others is that the storyline primarily uses the original historical account of the era, Records of Three Kingdoms by Chen Shou, as a reference rather than the aforementioned Romance of the Three Kingdoms novel. By this, the traditional hero of Romance of the Three Kingdoms, Liu Bei, takes on relatively less importance within the story and is portrayed in a less positive light. Yet, several aspects of the story are in fact based on the novel version, including the employment of its original characters such as Diao Chan, as well as anachronistic weapons such as Guan Yu's Green Dragon Crescent Blade and Zhang Fei's Viper Blade. A consistent theme throughout the story is Cao Cao's perpetual desire to break China and its people away from its old systems and ways of thinking and initiate a focus on pragmatism over empty ideals. This often puts him at odds with the prevalent customs and notions of Confucianism and those that support them. (Source: Wikipedia)

On an archaelogical mission to the end of the known universe, Professor Daiba unwitting unleashes an ancient horror from its confines. Five years later the malevolent alien force sets in motion a plan which reunites the various crewmembers of the Arcadia to sail the stars once more as well as bring Tadashi Daiba to meet Harlock for the first time (again). (Source: ANN)