Ore no Pet wa Seijo-sama

Tatsumi lost his family in a tragic accident during his final year of high school. His cockatiel, Chiko, passed away from old age as he grappled with his grief. On the brink of despair, he was transported to another world where he encountered Chiko again. She had been reborn as a radiant young woman revered as a saintess, which left him stunned. Now, she has chosen him as her fiancé, a decision that draws resistance from others. As they navigate this unexpected bond, they uncover a larger conflict surrounding their relationship.