Three years since the end of their intergalactic excursion, both Lafiel Abriel and Jinto Linn have reunited; Lafiel as the captain of the attack ship Basroil and Jinto as her supply officer. The restart of the war between the Abh Empire and the Triple Alliance thrusts the inexperienced duo into the forefront of the deadly conflict. As the catastrophic battle between pure humankind and their greatest creation, the Abh, rages on, both sides accept that their conflict is not merely about territory, but about settling the inherent differences between themselves.

Jinto and Lafiel were riding on a light-armed transport ship Bokbrusue and navigating at the planar space of the Hyde System. This was for Jinto to govern the Hyde System, which returned to Empirial rule after the Union retreated, officially as an Earl. However, the government of Martin, Jinto`s motherland, resisted obstinately against the Empirial rule. On the other side, Daiichi Jyuurin Sentai (the First Devastation Fleet), formed with the new ship type Attack Vessel, travelled to the Hyde System for drilling practices, but... (Source: ANN)

The rare and inexplicable Puberty Syndrome is thought of as a myth. It is a rare disease which only affects teenagers, and its symptoms are so supernatural that hardly anyone recognizes it as a legitimate occurrence. However, high school student Sakuta Azusagawa knows from personal experience that it is very much real, and happens to be quite prevalent in his school. Mai Sakurajima is a third-year high school student who gained fame in her youth as a child actress, but recently halted her promising career for reasons unknown to the public. With an air of unapproachability, she is well known throughout the school, but none dare interact with her—that is until Sakuta sees her wandering the library in a bunny girl costume. Despite the getup, no one seems to notice her, and after confronting her, he realizes that she is another victim of Puberty Syndrome. As Sakuta tries to help Mai through her predicament, his actions bring him into contact with more girls afflicted with the elusive disease.

Seiken Tsukai no World Break takes place at Akane Private Academy where students who possess memories of their previous lives are being trained to use Ancestral Arts so that they can serve as defenders against monsters, called Metaphysicals, who randomly attack. Known as saviors, the students are broken up into two categories: the kurogane who are able to use their prana to summon offensive weapons and the kuroma who are able to use magic. The story begins six months prior to the major climax of the series during the opening ceremonies on the first day of the school year. After the ceremony is over, the main character, Moroha Haimura, meets a girl named Satsuki Ranjou who reveals that she was Moroha's little sister in a past life where Moroha was a heroic prince capable of slaying entire armies with his sword skills. Soon afterwards he meets another girl, Shizuno Urushibara, who eventually reveals that she also knew Moroha in an entirely different past life where he was a dark lord capable of using destructive magic but saved her from a life of slavery. Can those whose minds live in both the present and the past truly reach a bright future? Delve into the complex world of Seiken Tsukai no World Break to find out!