Mom's Real Sex Education Marina Yuzuki.

"Marina" has been wearing "Yuto" because of her youthfulness. His father disappeared in front of Marina, and his son Yuuto was entrusted to a child care facility at an early age. And as time goes by, Marina is delighted to be able to live with Yuuto again. He loves Yuuto, who has become an adult body, and tries to deepen the bond between parents and children in the form of sex education.