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Henkyou Toshi no Ikuseisha

All of the strongest have been raised by the "Mentor."

A gentle young man named Haru is living in a run-down church in the outskirts of a frontier city, but his real identity is the legendary "mentor" whose pupils' names are famous throughout the entire continent. The next target of his guidance is Rebecca, a mid-rank adventurer whose progress had plateaued. How will Haru nurture the latent abilities of a girl who has given up on herself?

(Source: Kadokawa, translated)