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You know how Handyman Saitou in Another World is a slice-of-life series about an ordinary person using their practical skills in a fantasy world and being a huge help as a result? The isekai manga Dungeons That Surely Slaughter Adventurers is a similar sort of series, only with a more darkly comedic approach. The heroines Aine and Nacht are also using more typical skills in another land, but unwillingly and in a situation that’s leaving them despondent about what feels like a different sort of 9-to-5 gig.
First, the structure of Dungeons That Surely Slaughter Adventurers feels similar to Handyman Saitou, as each one features chapters that are self-contained stories about specific moments involving the leads, with things tying together overall in ways that set up a background for them and a story of sorts. Aine and Nacht started lives as ordinary folks in the real world. After remarking about how often folks are being run down by trucks, they bring up how their defenses are impenetrable. That’s when a jet engine falls off of a plane and lands on the duo, killing them instantly. Because they died this way, they’re now dungeon staff working to clean up as custodians, while folks who got hit be trucks are the adventurer heroes coming in all the time to kill their coworkers and mess things up.
So to get revenge, Aine and Nacht decide they’re going to do their best to make adventurers’ lives rougher. Especially since it seems like they’re stuck as janitors until other people die due to a falling plane engine.
There are many reasons why this succeeds. One is that Aine and Nacht are so deadpan about things and genuinely treat it as something like a normal custodian job. We’re not seeing them freak out about blood and violence too often, though there are some exceptions. (In particular, when a demon boss Aine got close to ended up wiped out by adventurers.) It really comes down to another day’s work, and that reaction makes it even more humorous.
Another is the fact that this is dark and mature humor. Which you expect considering they’re dealing with blood, guts, and death all day. Finding out another use of mandrakes and discussing things learned from a succubus end up being really funny in-context, and the fact that they respawn after their own deaths means there can be some great gags in the one-shots regarding older Looney Tunes style slapstick and violence. Keep in mind though that it can get dirty, literally, and makes light of some adult subject matter. Tactfully and in ways that are genuinely funny! But it’s definitely for an older audience.
Which makes it even more shocking when Dungeons That Surely Slaughter Adventurers ends up being incredibly cute too. A great early example involves kobolds. Once Aine and Nacht decide they’re going to make adventurers miserable, they decide to train these normally week enemies that are used to fill dungeons due to being weak and breeding quickly into actually formidable foes. They look like pugs. The training process is goofy. The results made me smile. It’s fun!
Dungeons That Surely Slaughter Adventurers is an unusual take on the slice-of-life style isekai story, but it’s quite successful. It’s absolutely silly and goofy, and it isn’t afraid to go dark or dirty for a laugh. Which also means it can be just as shockingly fun when it occasionally ends up a little wholesome (in a warped humor sort of way) too.
Volume 1 of Dungeons That Surely Slaughter Adventurers is available now, and Yen Press will release the second volume of the isekai manga on August 25, 2026.
