First released in 2008, now anime adaptation of Yosuga no Sora – In solitude, where we are least alone has been green-lit based on announcement from its first volume manga. The theme reminds me to H2o -Footprints in the Sand-. Both characters and background design are quite good and suites my taste. The description quoted from VNDB:
Two twins – Haruka and Sora, his younger sister, are going back to grandfather’s house.
They visited this house many times when they were kids and they still remember it. A while ago, they lost their parents in a car 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. Real feelings. The story now starts under the summer sun…
Here, you may wanna take a glance ^^