Deemed a "good-for-nothing" for his low level and lack of a god-given Gift, Allen is stripped of his noble status and banished from the Duchy of Westfeldt. But Allen has a secret: he was a great hero in a previous life, and he's thrilled for the chance to finally live the way he pleases! His drama-free existence, however, is soon interrupted by a desperate encounter with his ex-fiancée. As a former hero who still possesses the incredible powers from his past life, Allen can't ignore someone in need—no matter how much he might like to! And so begins the new heroic saga our former hero never wanted!

Due to poor lifestyle choices, a certain human's body is in constant turmoil. With germs, bacteria, and foreign substances abound, the jobs of various cells become increasingly difficult and dangerous. As some of the unfortunate ones who matured in this chaotic environment, Sekkekkyuu AA2153 and Hakkekkyuu U-1196 strive to fulfill their duties—even if it means seeing many of their fellow cells lose their lives in duty. Set in an environment vastly different from its parent story, Hataraku Saibou Black portrays the cells' struggles as they try to maintain the body's health. However, the human's condition continues to deteriorate, and whether or not these efforts will amount to something concrete depends on the cells! [Written by MAL Rewrite]

A high school loner is given the part-time job of a lifetime as a modern day ninja tasked to perform international assassinations. After World War II, Allied Command in Japan developed a new agency to help manage terrorism and violence within the Pacific region. The agency was staffed with ninja and they were initially tasked to handle domestic affairs. Eventually that program grew to its current form, managing 20,000 ninja across a range of domestic and international affairs. One of those ninjas happens to be Kudo. The seventeen-year-old high school loser is now poised to be the next line of defense against a potential surge in foreign assassins invading Tokyo.

After Rio escapes the capital of the Beltrum Kingdom with his former teacher Celia Claire and his bond spirit, Aishia, he finds himself in a dire situation once again. As it turns out, multiple people from his past life in Japan are suddenly scattered around the new world. Rio rushes to their help, saving a small group and taking them under his wing. To his surprise, one of the rescuees is his old self's childhood friend Miharu Ayase. The newcomers were not the only ones summoned. With old friends and new allies by his side, Rio sets out to locate the other abductees while searching for a way to send them back to Japan. However, Rio never loses sight of his main goal: avenging his mother's death.