Sakuya Shiina lives with Kanade, her male cousin and foster parent. In times of pain and sadness, she's always taken comfort in looking up at the stars. One day, a mysterious boy suddenly shows up at Sakuya'...

An 18 year old girl that is in love with her step brother who is same age as her and goes to the same school. She leaps through time and finds herself all grown up... what will happen on this crazy adventure...