Tail Concerto: Another Story
From Little Tail Wiki
Tail Concerto: Another Story is a short manga featured in the first volume of Tail Concerto Staffbon.
The story takes a brief glimpse into the world of Tail Concerto where Waffle Ryebread and Alicia Pris have a child together, though the latter two have seemingly been kidnapped or passed away in the hands of Fool. Seeking revenge, Waffle modifies his Police Robo to be more along the lines of a Titano-Machina with parts that appear to be organs.
Just as Waffle begins fusing with his new machine in a way not to dissimilar from others who succumbed to Titano-Machina, he wakes up from this nightmare scenario, revealing that things are still as they were in-game. Thus, this story is likely considered non-canonical.