Innkeeper

The innkeeper was the owner of a post-great disaster hotel who had her son Yuto eaten by a Hiruko.

Maru and Kiruko
sometime after Maru and Kiruko had defeated a few bandits, they stumbled upon the Innkeeper's hotel, and declared it heaven.

"Leanchoilia"
While Maru and Kiruko were in their sleeping bags, the Innkeeper went outside and began "defending the inn" However, the Kiruko stayed up late and saw the Hiruko, alerting Maru and going outside to kill the Hiruko. However, the Innkeeper later revealed that the Hiruko had eaten her son, Yuto, and the "Hiruko became him" as it had protected her from bandits. The Innkeeper managed to settle the Hiruko for a while as Maru and Kiruko stood in awe, however, the Hiruko soon attacked the Innkeeper and ate her. At first, Maru and Kiruko tried to run but eventually chose to fight the Hiruko. After a long battle, Maru would invade to core of the Hiruko and crush the core, killing the Hiruko.