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!

Taking place 30 years after the events of the original Youkai Watch TV series. There was once a 11 year old boy named Keita Amano who held a wristwatch that could command Youkai, he would make friends with the Youkai and fulfill a great many deeds. But when the boy grew up, he lost his ability to see Youkai. And as for the wristwatch that could control Youkai, its existence threatened to disturb the balance between human and Youkai worlds, so it was cast away into oblivion beyond time and space. Soon ... the story of the Youkai controlling wristwatch became but a legend. But then, something took place after many, many years had passed ... an epidemic Youkai virus known as Onimaro started affecting people with malevolent intentions and is spreading indefinitely, turning them into Kaodeka Oni and causing chaos throughout the city. With the end near, only the ones chosen by a new Youkai Watch can stand up against the upcoming threat and would save both Youkai and humans from certain destruction. (Source: Wiki)

Fifteen years ago, a hyperspace gate appeared in the middle of the Pacific Ocean, connecting Earth to a strange world filled with fairies and monsters. The city of San-Teresa became a home for over two million of these otherworldly visitors. Unfortunately, the population boom also brought its fair share of problems—drugs, prostitution, and trafficking. To combat the rampant crime lurking in the city's shadows, a new department was established in the San-Teresa Metropolitan Police. Former JSDF soldier Kei Matoba is one of the best cops that the department has to offer, despite his inclination to occasionally bend the rules. After a fairy trafficking case goes wrong, Kei loses Rick Fury, his friend and partner of four years, setting him on a quest for vengeance. To help him with the case, the department pairs him with Tilarna Exedilika, a noble of the Farbani Kingdom. As one of the Knights of Mirvor, her duty is to rescue the noble fairy that Kei encountered during his last case. Despite his distaste for non-humans, he accepts the arrangement at the request of his superiors. Now, the unlikely duo must come together and overcome their differences in order to return the missing fairy to her country and avenge the death of Kei's partner. [Written by MAL Rewrite]

In the future, age is not a factor to determine whether someone can perform a certain task or not, but special talent and training. An organization, Machine Robo Rescue (MRR), was established for robots and children to become partner and rescue people from danger. Then 12 children with various abilities were selected and introduced as part of this program: Robo Rescue! Meet Oozora Taiyou, one of the children who were chosen as a part of MRR program. After being late on his first day of training, he went to perform a hot rescue with JETROBO. However, a mysterious Robot from mysterious organization, "The Star"(?), appeared before MRR team to interfere with the rescue. What are the motives of the mysterious organization? And what are their goals? Life as one of the children chosen as part of MRR has started for Oozora Taiyou. Bumpy and hard training is just ahead for MRR team in order to protect many people's life!