My disciple has become the strongest human before I knew it, and I, a master with no talent, was mistakenly recognized as the strongest in the universe beyond that

Story:

Takumi was banished from the party and lived alone in the mountains. Leia, who claims to be a disciple of Alice, a girl who once protected and cared for him, came to him.. She has become a disciple of Takumi, who is rumored to be the strongest in the universe… Since then, a dragon, a great sage, and a goblin king have visited Takumi, who has no talent, and is suspected to be a demon king !?