My Dress-Up Darling follows Wakana Gojo, a high school boy who dreams of becoming a hina doll craftsman but hides his passion out of fear of being ridiculed. His quiet life changes when he meets Marin Kitagawa, a popular and confident classmate with a love for cosplay. Discovering Wakana’s sewing skills, Marin asks him to help create her dream costumes, pulling him into the vibrant world of cosplay. As they collaborate, Wakana gains confidence in his craft, while Marin admires his dedication and artistry. Their bond deepens as they share late nights of sewing, convention experiences, and vulnerable moments. The series blends heartfelt romance with themes of self-acceptance, creativity, and the courage to pursue one’s passions.