Marina is the mother of Miku and Ryuta Sugisaki.
Marina gets off sexually by being dominated or insulted, which has led to an infatuation with Mitsuba Marui based off of the stories that her children have told her.
Marina is a character in both Mitsudomoe anime series, Mitsudomoe and Mitsudomoe Zoryochu!, published by Aniplex with animation production by Bridge and the manga series Mitsudomoe, published by Akita Shoten and serialized in Weekly Shonen Champion. Marina's original design is credited to manga writer and illustrator Norio Sakurai while her anime version is credited to Takaharu Okuma. Marina makes her first anime appearance in Mitsudome episode 11, "Things Get Weird in Five Seconds".