Height: 167 cm
Mayumi is a heterochromia-eyed girl, half demon and half human, who is in Rin's class, good friends with Kaede and is always looking for news. She has the smallest bust size in the series, a fact often made fun of by Rin and Itsuki. Nonetheless, she takes pride in her small breasts, rationalizing that by being below average they are a rarity sought after by a select group of men. She may show feelings for Itsuki, despite of their frequent quarreling. It is revealed in Shuffle! Essence+ that she and Itsuki are indeed childhood friends.
Voiced by: Miki Inoue (Japanese), Kate Oxley (English)