Yuutousei ga Adult Goods wo Kai ni Kita

Aya Mizuki, a high school girl working part-time at a used bookstore that also sells adult goods, finds Yuuki Kayano, a top student from her class, in the adult section one day. Yuuki, who is highly respected at school, was actually carefully looking for items for “stress relief.” As the two share this little secret, their relationship gradually deepens… A high school girl-meets-girl story that begins with an unexpected encounter.

(Source: Comic Gardo, translated)