Inori and Aoi encounter a girl who is searching for something. She is Gumi Tomosaka, a classmate of theirs. She says she has lost a sticker that she cherished. It is a one-of-a-kind sticker that her younger brother and sister gave her for her birthday. Inori and Aoi are asked to help her find it. Inori and Aoi begin searching to fulfill Gumi's wish, but the sticker is nowhere to be found...