A Wild Last Boss Appeared!

A Wild Last Boss Appeared! (野生のラスボスが現れた！) is a Japanese light novel series written by Firehead and illustrated by YahaKo. It was initially serialized on the user-generated novel publishing website Shōsetsuka ni Narō from October 2015 to April 2019. It was later acquired by Earth Star Entertainment who published it under their Earth Star Novel imprint from February 2016 to April 2019. A manga adaptation illustrated by Tsubasa Hazuki began serialization on Earth Star Entertainment's Comic Earth Star website in June 2017.

Light novel
Written by Firehead, A Wild Last Boss Appeared! was initially serialized on the user-generated novel publishing website Shōsetsuka ni Narō from October 1, 2015 to April 15, 2019. It was later acquired by Earth Star Entertainment who published it under their Earth Star Novel light novel imprint with illustrations by YahaKo from February 15, 2016 to April 15, 2019. The series is licensed digitally in North America by J-Novel Club.

Manga
A manga adaptation illustrated by Tsubasa Hazuki began serialization began serialization on Earth Star Entertainment's Comic Earth Star on June 7, 2017. The manga's chapters have been collected into nine tankōbon volumes as of March 2024. The manga is also licensed in North America by J-Novel Club.