プライベート・プリンス,

Sakuragawa Miyako is a graduate student at Eito University against the wishes of her family. She finds out that the prince of Estolia is studying abroad and is at Eito University. She wants to get close to him only in the hopes of finishing her thesis on his great grandmother, Queen Ritsuko–but he has other ideas!?

(Source: Utopian Dream)

Included one-shot:
Volume 5: Sinful Love: Your Future is Mine