Butareba -The Story of a Man Turned into a Pig- (Manga) Volume 5 by Takuma Sakai

Turn into a pig once, shame on food poisoning; turn into a pig twice, shame on the pig. With the help of newfound comrades, Mister Scrawny Four-Eyed Super-Virgin makes a valiant return to the fantasy world of Mesteria—as a pig, of course!

Mesteria changed completely during his absence. The nation’s been torn apart by a war between the royal court and the underworld, and the handsome huntsman Naut has become a revolutionary focused on liberating all Yethma. However, he’s been captured and forced to fight as a gladiator. Together with Ceres and a new pig companion, Sanon, Mister Pig sets out on a journey to rescue Naut. But first, he has to sniff out some clues...