Yosuga No Sora

Haruka and Sora, his younger sister, move to a town where their grandfather lives. They visited his house many times when they were kids and they still remember it. A while ago, they lost their parents in an accident and they decided to move and live at their grandfather's house.... Nao, their old friend, Ryouhei, his classmate, Akira, a miko at a neighboring shrine, and Kazuha, Akira's close friend, welcome them. Nothing is changed.... His good old memories and silent atmosphere heal his sadness.... However, his peaceful life gradually changes.... A secret promise made long time ago. A lost treasure. A real reason for moving to the town. The story now starts under the summer sun....