Фуджімото Аяно

Ayano is a serious-minded student council vice president whose specialty is sweets. She is reputed for her high grades and reliability, but she often acts reserved yet cute. She is also very clumsy. She engages in olfactophilia, and though she does sniff around the boy's locker room, she became especially attracted to Keiki's smell and frequently ask for his underwear. Later she started to develop genuine affection for him since she voiced out her desire that if Keiki is not against it he may stay in the student council even after the Calligraphy Club’s debt is repaid. Not just as a temporary member, but a full-fledged one.

(Sources: Kawaikereba Wiki and Wikipedia)