機動戰艦
Piro, the protagonist, is an author surrogate of Fred Gallagher. Gallagher has stated that Piro is an idealized version of himself when he was in college. As a character, he is socially inept and frequently depressed. His design was originally conceived as a visual parody of the character Ruri Hoshino, from the "Martian Successor Nadesico" anime series. His name is derived from Gallagher's online nickname, which was in turn taken from Makoto Sawatari's cat in the Japanese visual novel "Kanon".