That Time I Got Reincarnated as a Slime: Clayman’s Revenge

That Time I Got Reincarnated as a Slime: Clayman’s Revenge is a manga side story that puts a known antagonist at the center of his own alternate path. Rather than retelling Rimuru’s rise, it uses time manipulation and a second chance to explore how a scheming demon lord might operate when he knows the future is closing in on him. The result is a companion piece for readers who already know the main TenSura world and want a different angle on its politics, rivalries, and supernatural machinery.

The experience leans into dark comedy, mystery, and slice of life elements while keeping an anti-heroic focus. Clayman’s perspective gives the material a colder, more calculating tone than the main series, yet the genre mix leaves room for lighter interactions and strange domestic details. The manga is listed as an original story rather than a direct adaptation, so even dedicated franchise readers can approach it as a separate what-if thread.

This work may suit readers who enjoy villain-led stories, time loops, and fantasy intrigue with a comedic edge. It is also approachable for those curious about TenSura’s wider cast but who want to explore that world through a manga side story. Because it assumes some familiarity with the franchise’s major players, newcomers may get more from it after encountering the main storyline first.

Clayman, a Demon Lord who once schemed for influence among the powerful figures of his world, meets his end at Walpurgis at the hands of Rimuru. In the final moments before death, however, he awakens a unique skill known as Regressor, and instead of perishing he finds himself back in his own room seventy years in the past, with his old ambitions, allies, and enemies all still intact.

Confronted with what appears to be a genuine second chance rather than a dying delusion, Clayman resolves not to repeat the path that led him to ruin. Armed with memories of what is to come, he sets about reshaping his plans, his relationships with his demon subordinates and attendants, and the schemes he once set in motion, hoping that small changes now will spare him the fate he already endured.

The central conflict lies in whether foreknowledge is truly enough. Clayman must work against the same pride, paranoia, and hunger for status that undid him before, while the world around him refuses to stay on the script he remembers. This spin-off follows his increasingly complicated attempts to overturn a doomed future, balancing scheming with the strange comedy of a Demon Lord forced to live his life over again.

Clayman's Revenge is a spin-off manga within the larger TenSura franchise, which began as Fuse and Mitz Vah's light novel series and expanded into a main manga adaptation, a television anime, films, and assorted side stories. Where the core installments follow Rimuru Tempest's reincarnation and nation-building, this title turns to a supporting antagonist and builds a separate narrative branch around him.

The series is an original work rather than an adaptation of the light novels. It reimagines the fate of Demon Lord Clayman, whose story in the mainline continuity ends at Walpurgis, and sends him back roughly seventy years into his own past. That premise makes it a what-if and alternate-timeline offshoot, not a continuation of Rimuru's arc and not a retelling of the primary novels. Its 2022 launch places it well into the franchise's later expansion period, alongside other side projects rather than at its starting point.

Familiar factions, demon lords, and setting details recur, so the manga rewards prior knowledge of TenSura while remaining a self-contained entry. Readers can approach it as optional companion material to the franchise hub, and the broader hub should not be treated as defined by this single work.