On days when she is sick, on days when she has a tedious day job, on days when she has regular tests.

On days when she is too lazy to go to school, I am called upon.
I am a convenient substitute for the body of a girl named Sonao Aikawa, and that is me.
I may look exactly the same, but my personality is a little different.
I can't go out freely, I can't even make plans for tomorrow,
I am a replica whose mission is to work for the original.
I was supposed to be a replica, but I fell in love.

A very pure and slightly mysterious "love story" that takes place in a town by the sea.