Underside - an Undertale AU

Underside - an Undertale AU

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WpMetadataNoticeLast published Sun, Apr 5, 2026
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Fanfic
Undertale
Universes, infinite possibilities. So what was this one called? Underside. A universe with unique properties and an infinite story. A long time ago, there was a war between two races. Monsters and humans. On day, the humans sealed the monsters underground with a barrier that could only be broken by seven human souls, or a monster and a human. That is the story that many have been told. Yet one human falls into the Underground, one who's SOUL does not possess the magic inside of her. But she can earn her trait, if she can escape the Underground. This AU is mine! DO NOT REPOST OR STEAL! Undertale is owned/created by Toby Fox!
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This story is a fan interpretation inspired by the upcoming GL series Pls Love starring Lena and Miu. While waiting for their series to begin filming and eventually be released, I wanted to imagine what their story might feel like - to give fans a small taste of the emotions, tension, and romance we might see on screen. This adaptation follows the same general premise and conflicts of the original novel, but it is written purely from my imagination. The characters keep the names Lena and Miu instead of the original names from the novel. Since I haven't been able to find a full English adaptation or translation of the novel, this story is based only on the summary and a few excerpts I have come across. Because of that, some details may differ from the original novel or the future series. This is simply a fan project created while we all wait for Lena and Miu's next series. I hope this story can give fans a small glimpse of the world we might soon see on screen.

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