A girl wakes up in a labyrinthine mansion and must escape safely.

A somewhat famous online streamer. They have a mentally unstable disposition and a desire for death, constantly saying they want to "die beautifully." Claiming to host a "suicide stream," they visit the Sea of Trees, but what awaits them there is a horrific ryona trap dungeon far more terrifying than death.

When I woke up, I found myself in a hospital. Why I'm in such place... I don't remember anything. I shrike when I find an arm which is Skeletonized.

In the battle against the True Ancestor, the church's saintess "Iris Chromel" has become a vampire. Facing the crisis of being expelled from her position as a saintess due to her transformation into a demon, she hears of a holy relic deep beneath the labyrinth city that can completely seal her vampiric powers. Thus, she sets out for the labyrinth city... Will she be able to conquer the dungeon and return to being human?