Bokura no Ai wa Kimochi Warui

Everyone is hiding a "secret."

Azuki Komugi is obsessed with ruminating on her memories of her high school girlfriend "Meguru," and creating a body model of hers out of clay. One day, Azuki drops her homemade "Meguru" at the 100-yen shop where she works part-time, and sneaks into her workplace on her off-shift to get "her" back. However, what she sees there is a fellow co-worker, high school girl Yoyuki Remu, who is about to express her lust for "Meguru" in a way that is different from Azuki's...

(Source: Ichijinsha, translated)