Yuiitsu Muni no Saikyou Tamer: Kuni no Subete no Guild de Monzembaraisareta kara, Takoku ni Itte Slow-Life Shimasu

Kohaku was supposed to be a monster-tamer, but he was completely unable to tame any ordinary monster. So he was labeled as "incompetent," but in fact, he was the only one who could take on the "phantasma", the legendary beast species! Kohaku, who had been banished by his guild in his home town, began to play an active role as soon as he moved to another country where he learned more about the phantasma! Furthermore, the phantasma monsters became attracted to him and began to chase after him! It's the carefree slow-life of the world's one and only phantasma tamer!

(Source: Hifumishobo, translated)