Yuiitsu Muni no Saikyou Tamer: Kuni no Subete no Guild de Monzenbarai sareta kara, Takoku ni Itte Slow Life shimasu  

唯一無二の最強テイマー～国の全てのギルドで門前払いされたから、他国に行ってスローライフします～

Tamer is an occupation that involves training monsters as companions. Kohaku's job was a tamer, but he couldn't control common creatures. He was labeled as inept and expelled from the guild. Despite this, he possessed a unique ability to handle Phantasma, mythical beings known for their immense strength and rarity. They have never been witnessed in public.