He is a member of the Liberal Party of Japan and, if I'm not mistaken, he even planned to work in this direction when the manga went on an indefinite hiatus. So I assumed it didn't work out if he went back to the manga. He also previously illustrated a comedic political manga in the past, from which the Akira character was taken with some developmental changes (?), which once fueled speculation about the connection between the two manga (in that manga Akira is already an adult woman and works as a deputy, while here she is just about to start political career). I don't follow Japanese politics, so I can't say what it means to "be a liberal" in Japan. But judging by his political retweets and the liberal initiatives I've ever heard of in Japanese life, it seems like typical US-inspired politics.