>>280839838LDP is not really a leftist party, they're on the right of Japan's political spectrum (though arguably left-wing in a global sense, depending on which issues you care most about)
While they lost a bunch of seats they're still the governing party (largely because the opposition is divided 10 different ways), and what lost them said seats is not "insane globalism" but a series of corruption scandals.
Also, he didn't personally lose his seat.