The DoDo Adventure Team receives an unsigned letter containing five plane tickets to Sydney, Australia.
In Sydney, they accept a commission and arrive at an alley that looks as if it has been abandoned for a long time.
A legend they hear from an old man makes the alley seem terrifying.
This only stokes the DoDo Adventure Team's enthusiasm for exploration.
The wind sweeps through the weeds at the alley entrance, revealing a stone tablet carved with a riddle.
A suicide song that rings out at midnight leads Charlie and Fuyou to meet a blonde girl who claims to be a puzzle solver from the Floating City.
Through their joint efforts, the truth behind the "Alley Suicides" from years ago comes to light.
It all stems from a bet between two prestigious families.
Lose the bet, and you'll sell your soul to the devil, doomed to suffer forever!
This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.