Ippo was raised by his mother, Makunouchi Hiroko for the majority of his childhood because Ippo's father, Makunouchi Kazuo died early in his childhood when his boat crashed in a storm. During the time when his father was missing out in the sea, Ippo went every day to the shore to wait for his return. He believed his father's words that upon his return he will never leave Ippo and Hiroko again. Although his father never returned, Ippo was able to satisfy himself that his father fulfilled his promise by finding the cap his father wore. After his father died, Ippo grew up assisting his mother with the family fishing boat business. During his school days, when ever something happened at school, he would come home, hiding his feelings by saying that he was okay.