Description: The protagonist Tatsuya lives with his stepmother named Aya... He's just an ordinary graduate student at the university. When he was still a child, his father told him that his mother had died. At present, his father is so busy with work that he practically does not appear at home ... Together with his stepmother, who is waiting ... life goes on. Weekdays all fly by and fly by until one dark day. They meet the beautiful widow Sumire, who has moved into the house next door.