Wakana Gojou, a high school student, dedicates himself to crafting intricate hina dolls, aspiring to match his grandfather's skill. While his classmates dive into popular culture, Gojou finds solace in designing outfits for his dolls. Despite his passion, he keeps this hobby hidden, fearing ridicule if exposed. Unexpectedly, Marin Kitagawa, a confident and popular girl, uncovers his talent and reveals her own interest in cosplay. Seeking his expertise, Kitagawa initiates a collaboration that bridges their contrasting personalities and brings them closer as they combine their sewing skills to create stunning cosplay costumes.