✓ Correct! “Different world” or “another world.” The word breaks into i (different) + sekai (world). The genre traces back as far as 1990s OVAs (Vision of Escaflowne, Fushigi Yuugi, Inuyasha) but exploded in the 2010s thanks to Sword Art Online (2009 LN, 2012 anime), Re:Zero, KonoSuba, Overlord and the “Narou” web-novel ecosystem of Shōsetsuka ni Narō.

✗ Wrong. The answer is “Different World.” Isekai breaks down literally to “i” (different) + “sekai” (world). It’s now used as a publishing-industry shorthand for the entire genre of transported/reincarnated/summoned-hero stories that boomed across the 2010s.

✓ Correct! Return by Death. Subaru’s ability is treated by Tappei Nagatsuki’s novels as a curse rather than a power — the Witch of Envy locks his memory of it (he physically cannot tell anyone he can rewind), and every “reset” means he genuinely dies. Re:Zero is widely credited with redefining the modern isekai psychological lane and remains one of the genre’s most acclaimed entries.

✗ Wrong. The answer is Return by Death. None of the other names are official. Tappei Nagatsuki’s web-novel-turned-LN coined “Return by Death” specifically and made the death-and-rewind a thematic engine: every reset means a real death and accumulating trauma.

✓ Correct! Aqua. The goddess of water, useless and proud of it. Kazuma’s entire character arc is being saddled with three of the most dysfunctional party members in any RPG — Aqua (the goddess), Megumin (the explosion-only Crimson Demon mage) and Darkness (the masochistic crusader who can’t hit anything). Aqua’s mortal terror of Drain Touch and undead is one of the show’s longest-running gags.

✗ Wrong. The answer is Aqua. Megumin is the explosion-magic mage. Darkness is the masochistic crusader. Wiz is the lich shopkeeper. The goddess Kazuma drags into the fantasy world — and the source of about 90% of the party’s problems — is Aqua.

✓ Correct! Rimuru Tempest — surname taken from Veldora Tempest, the Storm Dragon Rimuru befriends and absorbs in his first cave. By the time the series gets going, Rimuru is the founder and ruler of the monster nation Tempest, a Demon Lord, and the most powerful single character in his world. Fuse’s web novel started in 2013, Kawakami’s manga adaptation is over 25 volumes deep, and the 8-bit Studio anime is still ongoing.

✗ Wrong. The answer is Rimuru Tempest. Lugh Veleno is the protagonist of The World’s Finest Assassin Gets Reincarnated. Hajime Nagumo is the lead of Arifureta. Naofumi Iwatani is the Shield Hero. The slime who eats Veldora and names himself Tempest is Rimuru.

✓ Correct! Ainz Ooal Gown. Originally the name of Momonga’s 41-member Yggdrasil guild — the “Nine’s Own Goal” in original Japanese — he reclaims it as his personal alias to honour his absent guildmates. Maruyama’s LNs and Madhouse’s anime treat the protagonist as a slow-burn villain: a skeletal Eldritch Lord trying to figure out what he’s become while his floor guardians worship him as a god.

✗ Wrong. The answer is Ainz Ooal Gown. Albedo and Cocytus are NPC floor guardians of Nazarick. Demiurge is another floor guardian. Touch Me was a famous member of the original guild but isn’t Momonga’s alias. The protagonist takes the guild’s own name, Ainz Ooal Gown.

✓ Correct! Aincrad — the floating fortress designed by lead-developer-villain Akihiko Kayaba. Reki Kawahara’s LN began as a 2002 web novel and was adapted by A-1 Pictures in 2012, kicking off the modern isekai boom. The series moved through other servers/worlds across its sequels (Alfheim Online, Gun Gale Online, Project Alicization’s Underworld) but Aincrad remains the foundational setting and the brand image of the franchise.

✗ Wrong. The answer is Aincrad. Alfheim is the fairy-themed VRMMO of Season 1’s back half. Gun Gale Online is the FPS arc. The Underworld is the simulated world of the Alicization arc. The first-season death game is the floating fortress Aincrad.

✓ Correct! Rudeus Greyrat — born to swordsman father Paul and maid mother Zenith in the Buena Village in the Asura Kingdom. Rifujin na Magonote’s web novel ran from 2012–15 on Shōsetsuka ni Narō and is widely credited as the prototype for the modern reincarnation-isekai template. Studio Bind’s anime adaptation (2021–) is one of the genre’s most lavishly produced.

✗ Wrong. The answer is Rudeus Greyrat. Cid Kagenou is the lead of The Eminence in Shadow. Ars Lalatoya is Rudeus’s son later in the series, not Rudeus himself. Subaru Natsuki is the protagonist of Re:Zero. Rudeus is the reborn-as-a-baby protagonist of Mushoku Tensei.

✓ Correct! Shōsetsuka ni Narō (literally “Let’s Become a Novelist”), commonly abbreviated to “Narou.” Launched in 2004, by the early 2010s it had become the dominant funnel for amateur isekai web novels — with publishers like Kadokawa and Shueisha trawling its leaderboards for hits to acquire. So many isekai LNs originated there that “Narou-kei” (Narou-style) became a publishing-industry shorthand for the genre’s tropes (overpowered protagonist, cheat skill, harem dynamics, RPG status screens).

✗ Wrong. The answer is Shōsetsuka ni Narō (Narou). Comico is a Korean-style webtoons platform. Pixiv Novels is a sister site to the Pixiv illustration platform but isn’t the dominant isekai pipeline. Niconico Books doesn’t exist as a major publishing platform. Narou is where the modern isekai boom was incubated.