After a heart-wrenching breakup, high schooler Aoi Mashiro yearns to confront her ex-boyfriend, but lacks the means for a return trip home. Desperate, she pilfers two ancient scrolls from her grandfather's collection and seeks their worth at a quaint antique store nestled in Kyoto's bustling Teramachi Sanjou district. Unbeknownst to her, a life-altering encounter awaits within those walls. There, she encounters Kiyotaka Yagashira, an astute graduate student dubbed 'Holmes' for his impressive deductive prowess and familial ties to the shop. Impressed by Aoi's choice of items for appraisal, Kiyotaka recognizes a kindred spirit in her keen intuition. Moved by her circumstances, he extends a job offer, allowing Aoi to earn her fare back on her own terms. Thus begins their joint venture, not just in the store, but also as a dynamic duo assisting townsfolk with their intricate dilemmas. With Kiyotaka's logical reasoning and Aoi's intuitive insights, they navigate through mysteries, establishing themselves as a formidable contemporary rendition of the iconic Holmes and Watson.