In the year 2020, a nation faces the pervasive threat of the Others—mysterious monsters who fall from the sky and feed on human brains. At the same time, psionics, a hormone that gives certain people extrasensory abilities that are effective against the Others, is discovered in the human body. Subsequently, the nation's founder establishes the Other Suppression Force (OSF) to combat these monsters and save humanity. Commonly referred to as the Scarlet Guardians, young individuals with psionics undergo intensive training to join this group. One day, the nation prepares an induction ceremony for the exceptional recruits who completed the grueling training to become Scarlet Guardians. Among these young elites is Yuito Sumeragi, the determined son of the nation's founder; at the age of five, he was rescued by a woman in the OSF. To repay this debt, he joins the organization, eager to put his training to good use. As he meets his new comrades, he faces a big problem—the woman who saved him years ago closely resembles one of his teammates. However, this should be the least of his worries—unbeknownst to him, a conspiracy is brewing, one with the capability to shake the entire country.

Momo Minamoto is a shy teenager who simply wants to do good in the world. Her dream is to follow in her police officer father's footsteps and support law and order. And just like him, she has a very unique ability: her senses are much more refined than those of any average person. A simple lick will enable her to determine what someone is feeling. One night, as she admires the landscape, Momo sees suspicious shades moving in the distance. After learning that those shades were spies, she is recruited by their captain Yuki Hanzoumon, a senior at her school. The members of their secret agency, called the Tsukikage, also have the power to gain strength after ingesting spices. Release the Spyce is an action-packed spy series about the Tsukikage's missions as they fight in the shadows to protect the city from crime while keeping up with their high school life.

Once believed to be extinct, ninjas have reappeared in contemporary Japan following the Pacific War. With a headcount rumored to be two hundred thousand, these deadly assassins are now tasked with covert operations, infiltrating a significant portion of the nation's public and private institutions in the process. Among these ninjas is Kurou Kumogakure, who often spends his days in a run-down apartment with no motivation to do much of anything. Some might consider him a useless vagrant who does nothing but steal beer from his neighbor. Nevertheless, the 17-year-old loser might actually be more dangerous than his demeanor suggests. Kurou's hidden potential is put to the test when he is given a new mission to infiltrate a local high school, but there is more to this assignment than he could ever predict.

Tuğrul Mahmut is a young pasha serving on the Divan of the Türkiye Stratocracy. The clouds of war are gathering over his country due to the threat of an aggressive Empire. With the Divan split between warmongers and the pacifists, Mahmut begins his quest to keep the peace at any cost. As he finds himself deeper and deeper in the politics of the ancient world, new enemies and allies surface. Who will prevail? What will Mahmut do if war proves to be inevitable?