Gekkou Chou

Gekkou Chou summary:

From Aerandria Scans: A voice echoes through the night - the voice of the boy who hit a girl with his bicycle and ran. The words are curses for the perfect older sister people constantly compare him to... When Na hears the passionate wish made to the moon, she comes down to Earth in the shape of a butterfly to comply with that wish - in return for the sacrifice the butterfly requires.