The Record of Raising Leina

The protagonist, Yun, is reincarnated in another world reminiscent of medieval Europe. As a child, he is found to have an affinity for holy light. At twenty, he is promoted to a high-ranking cleric. He then learns from the church that the heroine, Reina, is to be abandoned because her magic has spiraled out of control. Unable to bear the thought of her tragic fate, Yun resolves to adopt her. He wins permission at the Holy Synod despite fierce opposition, but Reina’s instability gets him transferred from the royal capital to the remote town of Morning Dew.

This story takes place seven years after he adopts Reina. During those seven years in his care, Reina comes to see Yun, who saved and adopted her, as the only light and meaning in her life.