Demonion: Gaiden
Oshimeter
Synopsis
Sealed underground for two centuries, Astaroth — once powerful enough to drag the world into war before a band of heroes finally put him down — is back, and word spreads fast. Adventurers start flooding into his labyrinth, chasing fame and the bragging rights that come with slaying a legend. What they don't account for is that Astaroth has had two hundred years underground to think about what comes next. This 2-episode OVA is adapted from a dark fantasy visual novel, and it carries that DNA throughout — the labyrinth setting feels genuinely layered, full of traps and power dynamics that make every encounter feel loaded. Characters like Miska and Oboro aren't just window dressing; they're caught up in something that has real weight to it. The tone leans dark and deliberately paced rather than action-spectacle, so if you go in expecting that, it lands better. It's a hentai title, so that's the context going in — but if you've enjoyed the demon lord premise done with actual world-building in things like How Not to Summon a Demon Lord or Demon King Daimao, and you want something that commits harder to the darker end of that fantasy, this scratches a specific itch. Don't expect a full arc in two episodes; think of it more as a tone piece that establishes a world worth sitting in for a while.
Episode Guide
Characters
Vanessa Cromwell
Commander Vanessa Cromwell, the 'Golden Goddess of War', is a renowned lance wielder, fiercely loyal and protective of the Queen.
Portrayed by Asai Harumi
Arwin Silvermoon
Naive elf, Arwin, fights to protect her forest home from Astaroth's demonic threat.
Himika Sumeragi
Portrayed by Kasuga An
Julian Balcraft
Lone warrior Julian, scarred by past betrayals, battles Astaroth's forces alone.
Lavrith Tranzatto
Stubborn paladin Lavrith, a saint knight, fights demons and enemies of church and kingdom.
Olivia Elroy
MANGA BRIDGE
This season covers Chapters 1-null of the manga. Continue reading from Chapter 1.

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