Sun-ouji wa Tsuma ni Naritaiサン王子は妻になりたい; Prince Sun Wants to Be a Wife; O Príncipe Sun Quer Ser Uma Esposa; El Príncipe Sun quiere ser una esposa; Hoàng tử Sun muốn trở thành vợ

Keitarou, dreaming of a soulmate, meets a beautiful brown girl(?) Sun. Apparently, he'd promised to marry Sun when they were young and it turns out he's a prince of the kingdom of Caglionia! Will they find their soulmate in each other!?