Another few ideas that popped into my mind:
Shojo-Jo Miyu
Roughly translates to 'Virgin Queen Miyu', the setting is based around a Hegemonic Empire similar to that of Byzantine Empire which dominates it's continent in terms of politics influence through the use of diplomacy and threat of force. However, it's recently crowned Emperor is killed by mysterious circumstances leaving his distant cousin (The main character Miyu) as his successor. Despite her young age and protest from the conservative elements of the government, she ascends the throne and is immediatly forced to deal with the political turmoil that follows the running of a large Empire.
To do this, she'll have to use her wits and instinct to know which advisors to trust, figure out who would want to usurp her throne, and also deal with potential romantic interests who would want to marry her for a variety of reasons.
Flashpoint: Hikaru City and the Iron Curtain
With the premature death of Winston Churchill in 1940, Great Britain signed a peace deal with Nazi Germany which resulted in a completely different conclusion to WWII. America fights Germany well before Pearl Harbour but without England as a base to conduct it's liberation of Europe, it turns most of it's fighting effort on Japan, beating earlier than 1945 which means the Atom Bomb never had to be used on them. Instead, Japan is divided up (Like Germany during the Cold War) between the USSR and the USA and divided by a long wall as the war continues on in Europe.
The year is now 1958 and Europe is still a battleground between Nazi's and a reluctant Russian-American alliance. However Japan is the main focus of the story as the Russian and American occupied halves are growing increasingly hostile to each other due to idealogical differences.
This is where the main story starts as a group of orphans in the Communist side sneak out of their orphanage one day and accidentaly uncover experimental government technology which gives them powers unique to their personalities. At first they intend to use them for good to help out their run-down community. But as their powers grow, they soon come to realise that they have deadly side-effects, and that both the American and Russian governments are interested in using them for their own purpose. With this in mind, how can they know which side they should be fighting for?
Anyways, just something I thought would be interesting to share.