The protagonist (Tatsuya) lives together with his stepmother Aya... He's an ordinary graduate university student. When he was still a child, he was told by his father that his mother had died. At present, his father is so busy with work he rarely has time to come home... Along with his stepmother who kept waiting...life moved on. The empty days kept passing until one dark day. They met the beautiful woman(Sumire) ,who claimed to be a widow and had moved into the house next door.

Looking from his mother's face, to the woman's...