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

In a world where Tamers hold the esteemed profession of subduing monsters and binding them as familiars, Kohaku finds himself entirely unsuited for the role. Despite his chosen vocation, he is completely unable to tame ordinary creatures, a glaring deficiency that earns him the harsh label of "incompetent." Rejected by every guild across the nation, he is ultimately banished from the very organization that defines his profession, leaving him without a place in his homeland. Yet, this apparent failure conceals an extraordinary truth. Kohaku possesses a unique ability exclusive to him alone: the power to tame Phantasmas. These mythical entities are legendary species of such overwhelming strength and extreme rarity that they have never once been witnessed by the public eye. While the world dismissed him as worthless for lacking conventional skills, he unknowingly held dominion over the most formidable creatures in existence. Driven away by a kingdom that refused to see his true worth, Kohaku makes a life-altering decision. Leaving behind the guilds that scorned him, he journeys to a foreign land. There, far from the prejudice of his past, the unmatched Tamer sets out to forge a quiet, peaceful life alongside the mythical beings only he can command.