Gender: Male Age: 29 Occupation: Construction worker Education: High school graduate Experience: Virgin Yuta's father (though not biologically related). One day, his girlfriend at the time (Mami) suddenly appeared with a baby, told him it was his, and dumped the child on him. She vanished a few days later, and he has been raising Yuta alone ever since. Because he skipped most of his classes in school, he has absolutely no idea what actually needs to happen for a child to be conceived.

Gender: Male Age: 9 (4th Grade) Hayato's son. His mother vanished shortly after he was born.