Fumie Fusano is a 24-year-old Japanese woman with brown hair, brown eyes, standing 1.63 meters tall and weighing 51 kilograms. Her notable physical proportions are 103-60-88 centimeters, particularly her bust. She teaches professionally, approaching her duties with seriousness and reliability. Fumie lives in a spacious apartment with her younger sister, Tomoka Fusano, and is neighbors with Wataru Sakurai, a former childhood acquaintance. Following the departure of Wataru's father overseas, Fumie assumes a caretaking role for him.

Despite her professional demeanor, Fumie experiences internal conflict over developing romantic feelings for Wataru, who is her student, initially struggling to acknowledge them due to her sense of responsibility. She eventually yields to his persistent advances and reciprocates his affection, fully aware her sister Tomoka also harbors strong feelings for him. This marks a significant shift as she transitions from reserved behavior to openly expressing desire and pursuing her romantic goals assertively. She displays fierce resolve to maintain her relationship with Wataru, unwilling to relinquish her deep affection despite the complications involving her sister.

Her physical attributes, particularly her large bust, become a source of confidence that aligns with Wataru's preferences, enabling her to satisfy him by leveraging this trait. This confidence fuels increasingly uninhibited behavior; she shows no hesitation in showcasing her feminine charms and adopts a more sexually liberated attitude. Her commitment extends to accepting an unconventional arrangement where she shares Wataru with her sister Tomoka. The character originates from a visual novel and appears in a subsequent four-episode OVA adaptation released between March 2005 and November 2006.