Sabikui Bisco

is a Japanese light novel series written by Shinji Cobkubo, with illustrations by Akagishi K. The series began publication on March 10, 2018 by ASCII Media Works under their Dengeki Bunko publishing imprint.

The series won the Silver Prize in the 24th Dengeki Novel Prize.

The series has been licensed for an english release by Yen Press under their Yen On Imprint.

Synopsis
Akaboshi Bisco, a "mushroom protector" who runs through the "rusty wind" that rusts everything and threatens humanity to death. He was traveling in search of the rust-eating mushroom, a spiritual medicine to save his master.

Bisco jumps out on a turbulent adventure with a beautiful boy doctor, Miro. The Saitama Iron Desert that spreads on the way, the town that was made into the remains of the defense weapons that destroyed civilization, the abandoned line of the large octopus nest subway. The inspiration of Miro's wisdom and the mushroom arrow, which is indispensable for Bisco, pierce the threats that are approaching one after another on the harsh road! However, beyond that, there is an evil prefectural governor's plan.

An adventure fantasy shot by a strong bow to save a loved one!

Characters

 * Bisco Akaboshi
 * Milo Nekoyanagi
 * Paw Nekoyanagi
 * Chiroru Oochagama

Rust-Eater Bisco
An anime adaptation of the light novel was announced at KADOKAWA's Light Novel EXPO 2021. The release date is yet to be announced.