Butareba -The Story of a Man Turned into a Pig- Second Bite by Takuma Sakai

With the help of newfound comrades, our otaku protagonist makes a valiant return to the fantasy world of Mesteria—as a pig, of course! However, his most precious heroine, Jess, is missing. But that doesn’t matter because he didn’t come back to enjoy a fluffy fantasy life with Jess. He totally doesn’t miss the girl he fell head over heels for! He’s not s-whining or dis-grunt-led at all!
There are also more pressing problems Mister Pig must deal with. Mesteria changed completely during his absence. The nation’s torn apart by a war between the royal court and the underground society, and the handsome huntsman Naut has become a revolutionary focused on liberating all Yethma. Our protagonist’s mission is to help Naut and save the poor Yethma of this world! Together with Ceres and a new pig companion, Sanon, Mister Pig sets out on a journey filled with twists and turns. Will he reunite with his sweet, angelic savior?