Mukashi Yuusha de Ima wa Hone

is a Japanese light novel series written by Yosuke Saeki, with illustrations by Pairan. The series began publication on December 9, 2017 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Alvis, the hero, lost his life in a battle with the Demon King. However, he lived on... as a skeleton!? Ending his career as the hero who defeated the Demon King, he spent 3 years sleeping, playing and enjoying every day. However, in order to find his long-time friend Izana, he once again enrolls as an adventurer, and changes his name from Alvis to Al the Skeleton. Due to his appearance being that of a skeleton, trouble is not out of the question for his near future! Protecting traveling merchants, mapping unexplored dungeons and so on; while undertaking numerous requests, Al the Skeleton wields his sword another day in order to save lives.

Manga
The manga adaptation of the light novel: with art by Keyaki Uchiuchi. It was serialised in Tokuma Shoten's ArkLight Comic and published under their Ryu Comics imprint from March 2020.