The protagonist Kazuki was told by his adoptive parents, his uncle and aunt, that he lost his parents and his memories in an accident when he was a child.

He tells himself that there is no point in worrying about the past, but his childhood friend Iroha, worries about him too much about everything he does.

He had a complex of unable to refuse to anyone.

ーーOne day, he receives a note in his shoe rack from an unknown sender.