Kaminaki Sekai no Oneechan Katsudou  

What My Older Sister Does in a World Without Gods, 神無き世界のおねーちゃん活動

If there is no belief in God, and yet someone is considered valuable like a deity, then it's said that she was reborn as a "goddess." She searches for her brother Yukito in another realm. This new myth of the oneechan has started.