The Takasugi family, once a poor single-mother household, gained a stable life after the mother, Kyoko, remarried Yoshio, an elite salaryman. Yoshio seemed like a good father at first, but one day he revealed his true nature and sank his fangs into Mari. Out of consideration for her mother's hardships and her feelings for her sick younger brother, she began days of quietly enduring humiliation for the sake of her family's happiness... Right beside her mother, near her brother, and even while her boyfriend is visiting, she continues to endure unwanted orgasms today...