High school student Wakana Gojou spends his days perfecting the art of making hina dolls, hoping to reach his grandfather's level of expertise eventually. While his fellow teenagers busy themselves with pop culture, Gojou finds bliss in sewing clothes for his dolls. Nonetheless, he goes to great lengths to keep his unique hobby a secret, believing he would be ridiculed if revealed.

Enter Marin Kitagawa, an extraordinarily pretty girl whose confidence and poise contrast with Gojou's meekness. It would defy common sense for the friendless Gojou to mix with Kitagawa, whom her peers always surround. However, the unimaginable happens when Kitagawa discovers Gojou's prowess with a sewing machine and brightly confesses to him about her own hobby: cosplay. Because her sewing skills are pitiable, she decides to enlist his help.

As Gojou and Kitagawa work together on one cosplay outfit after another, they cannot help but grow close—even though their lives are worlds apart.