Crow Demon's Child

A teenage girl named Mei Kageyama meets a boy named Yukio Kageyama, who later revels to her that he is a Karasu Tengu. They fall in love and then some time later they got married and have a baby boy who they named, Kageyama Tobio, but their love for each other wouldn't be enough, when a strange hooded man named Kira, who is also a Karasu Tengu but evil, tries to kill their baby after finding out about their love for each other and the birth of their child, Yukio and Mei had to protect their only son from him, they wouldn't want to lose their child. So, Yukio and his followers, who are also Karasu Tengus, had to leave in order to keep the baby safe, but before he leaves, he gives Mei one of his crow feathers as a necklace for protection, as a reminder that a part of him will always be with her. Since that night, she thought she'll never see him again, until some time after he left, he returns home and decides to help her raise their son together. Years later, Kageyama Tobio later finds out that he's half Tengu and when his parents mysteriously disappeared, he and his friends embark on an journey to find them, solve the mystery of their disappearance, and stop Kira from summoning the mother of all Tengus, RavenClaw.