Fundraising for Love Trophy in Gal*Gun: Double Peace

To get Aoi's ending, you need to donate to LOVEHEARTS in the Academy Shop which can be found at the bottom of the item lists. Play through any route and save up all your feathers. It costs 100 -> 500 -> 1500 -> 5000 -> 9999 Feathers. Once you have donated the last 9999 feathers, she will thank you then ask you to move to America with her. Say yes and you will get her ending. Note: Save before doing this if you are doing a route for another Ending, because getting Aoi's ending will end the game.