In Chainsaw Man, Denji is working as a Devil Hunter just to pay his deceased father's debt, one day he is betrayed and murdered, however, he ends up merged with a demon named Pochita.
In Beast Tamer, Rein is kicked out of the hero party and starts a journey as an adventurer, where he meets Kanade, a girl from the rare and strong cat tribe, and they decide to form a contract.
In Cyberpunk: Edgerunners, David has lost his mother and home, to survive in a city overrun by corruption, crime and technology, he becomes a high-tech mercenary.
In Kuro no Shoukanshi, Kelvin learns that he bartered away his memories in exchange for powerful new abilities in a new world, and that Melfina, a goddess is with him.
In Bastard!! Ankoku no Hakaishin, modern society was destroyed by the God of Destruction. Years later, Dark Schneider wakes up and leads a group in an attempt to control the world.
In Shinobi no Ittoki, Ittoki was an ordinary student, until he finds out that he is the heir of the famous Iga Ninjas. Now he must become a ninja and save his life from the Koga.
In Fushigi no Umi no Nadia, Jean sees a girl with beautiful dark skin in France, he decides to follow her and finds out she is in danger, as robbers want to steal her amulet.
In Hoshi no Samidare, Yuuhi is your average college student, at least until the day he wakes up and finds a lizard in his bed who claims he must save the world.
In RWBY: Hyousetsu Teikoku, the world is plagued by deadly monsters known as the Grimm. Huntresses protect humanity, Ruby, Weiss, Blake and Yang are among them.
In Engage Kiss, Shu runs a private military company, and tries to defend a floating city from demons. He has an odd relationship with Ayano and a demon named Kisara.