Tales of Crestoria: Togabito no Zaika

Kanata Hjuger is a naive, idealistic young man raised in the rural village of Dalchia. He held his father, the founder of the local orphanage, in high regard as he worked to provide homes for children from all over. That changed one night when he spied his father and his orphaned friend, Misella, alone in a room together. The orphanage harbored a dark secret; instead of being rehomed, children were being sold as slaves, and Misella would be next. In a rage, Kanata kills him and is immediately entrenched in guilt. The villagers soon discover Kanata's crime and they want justice, but Kanata wants to live.

(Source: Kodansha, translated)