In Glasslip, Touko Fukami, a young glass artist from a lineage of artisans in Fukui, enjoys a carefree existence until she starts glimpsing future images. When she encounters the mysterious transfer student Kakeru Okikura during her 18th summer, their fateful connection alters the course of her ordinary life. As Kakeru's arrival intertwines their paths, Touko and her four friends find themselves embarking on a summer filled with anticipation, love, and pain, all guided by the enigmatic voices and visions from the days ahead.