People have made a great deal out of the "high" percentage of votes among voters between 20 and 30 years old that went to Mr. Toshio Tamogami, ex-Chief of Staff of Self Defense Air Force. But if you look at the absolute number of votes cast by this age group, they were insignificant.
Much more solid showing of Mr. Tamogami in the 30-40 years old and 40-50 years old brackets is more interesting. There, Tamogami almost equally split votes cast with both Utsunomiya and Hosokawa.
Anyway, people in 20s, 30s, 40s, and 50s who live in Tokyo (particularly those in their 20s) couldn't be bothered to go to vote on a snowy day in the middle of potentially an extended weekend (if they took Monday off), and we got Mr. Masuzoke, a puppet for the Abe administration whose agendas turned out to have been hinged on this election.
Another way to look at this chart is to eyeball and lump Masuzue and Utsunomiya votes together as "organized votes": Masuzoe - LDP, Komei, Soka Gakkai and Labor Union, and Utsunomiya - Communist Party, Social Democrats, Labor Union. Both Masuzoe and Utsunomiya pretty much maxed out on the votes they could get through the organizations that backed them. Utsunomiya's votes this time were hardly different from what he had gotten in December 2012 gubernatorial election where Inose had won with more than 4.6 million votes.
Hosokawa and Tamogami, over 1.5 million votes between them, got their votes from people with no party affiliation. If the voting rate had been much higher, I suspect they both would have easily gotten double of what they got.
Chart created by @joe0212t, English labels are mine:
Meanwhile, Governor Masuzoe tried his chair in his governor's office, and said "It's just an ordinary chair."
Mr. Hosokawa issued his message to his supporters apologizing that he couldn't beat Mr. Masuzoe.
Mr. Utsunomiya visited the Communist Party headquarters, and together with the party chairman, celebrated his "win" over the two former prime ministers. "Sense of accomplishment," said Mr. Utsunomiya.
Governor Masuzoe is also busy peddling his new book on his Twitter. The topic of the book? Constitutional amendment.
(Are you starting to freak out yet?)