did he have to resign for this?
Yes, he officially ended his term on  26 September 2007.
Shinzo Abe
On 12 September 2007, only three days after a new parliamentary session had begun, Abe announced his intention to resign his position as prime minister at an unscheduled press conference. 
where did titans came from attack on titan UNANSWERABLE is it a film or tv series? An anime television series who is the director? Tetsurō Araki is it based on any novel? Yes which one? UNANSWERABLE is it politically interpreted? Yes, one of the magazine accused them of having a militaristic message that serves Japanese Prime Minister Shinzo Abe's political leanings. can you name any character from it? Eren Yeager, Mikasa Ackerman and Armin Arlert. when was the above mentioned person elected as the mentioned minister for the first time? 26 September 2006 was he unpopular? Yes, his rejection of a possible female Japanese monarch also diminished his popularity.
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Shinzo Abe [SEP] Unpopularity and resignation
Abe said his unpopularity was hindering the passage of an anti-terrorism law, involving among other things Japan's continued military presence in Afghanistan. Party officials also said the embattled prime minister was suffering from poor health. On 26 September 2007 Abe officially ended his term, and Yasuo Fukuda became the new prime minister of Japan.