A powerful necromancer known as the Corpse God dies during a legendary battle, only to be reborn as Polka Shinoyama, a young boy in modern-day Tokyo. In the process of trying to adapt to his new physical body, he gets targeted by various groups that deal with the supernatural. Among them is Misaki Sakimiya, a high school girl who can see spirits and is out for his blood from the very moment they meet. Attempting to make sense of this situation where unknown parties want him dead, Polka eventually meets Takumi Kuruya, a contractor skilled in surveillance and hacking, and Lisa Kuraki, a crime boss operating out of Shinjuku. Alongside these—and other unexpected—allies, Polka braves danger to reveal the truth of his reincarnation and the fate awaiting the world he now lives in.

The infamous series of unexplainable murders in Hinamizawa have been solved and the chains of fate have broken due to the efforts of Rika Furude and her friends. Rika believes she has finally obtained the normal and peaceful life she desired with her friends; however, she is proven wrong when the wheels of fate begin turning once again after an unfortunate accident. Rika suddenly finds herself in a perfect world, the constant cycle of brutal killings having never taken place, where all of her friends are content and satisfied. Not wanting to abandon the world that she fought so hard for, she learns she must destroy an essential key to get back. But can Rika abandon the faultless world she is given the chance to live in, after all of her battles have brought her this far?

One day, a man claiming to be a god suddenly hacks a certain school's intercoms, ordering all of its students to team up and prepare to be transported to another world. There, they will be given special skills in the hopes that they become that world's heroes and defeat the Demon King that ravages the land. The initial transfer is a success. However, Seiichi Hiiragi, who suffers from his classmates' constant bullying due to his somewhat undesirable appearance, is left behind as no one is willing to be his teammate. Nevertheless, the self-proclaimed god decides to send Seiichi to the parallel world and lets him join his peers. Unfortunately, this fateful ordeal causes Seiichi to arrive at a location deep in the forest, far not only from his schoolmates but from human civilization as well. Desperately searching for a way to change his predicament, Seiichi's miserable days only seem to continue to worsen. Yet when all hope seems lost, Seiichi discovers a strange fruit known as the Fruit of Evolution—which may be his first step toward a significantly better future.

After working tirelessly toward his goal of a self-sustainable NEET lifestyle, Kinji Ninomiya has finally achieved his dreams. Now looking down on common folk commuting during a typhoon from the penthouse of one of his apartment buildings, Kinji gets ready to start his new, slothful life. However, all of his hard work goes to waste when a portal appears beneath him from out of nowhere. Teleported to another world, Kinji is forced to work for a mining company that focuses solely on profits and has no care whatsoever for the safety and well-being of its employees. Refusing to live in such conditions, he begins devising plans to get rich quickly, building connections with others in this new world and making his best efforts to escape the stringent corporate life. Will Kinji be able to overcome his restraints and attain financial freedom once more?