Isekai Shoukan Sarete Kita Seijo-sama ga "Kareshi ga Shinda" to Naku Bakari de Hataraite Kuremasen. Tokoro de Sono Shinda Kareshi, Zense no Ore desu ne.

Reincarnated as the third prince of the peaceful island nation of Astraea, Edward has lived a free and easy life. However, his life changes drastically with the appearance of a saint summoned by the goddess. Edward is chosen to be the caretaker of the saint, instead of his more handsome and accomplished older brothers. It is a great responsibility...