A six-year-old boy receives a summons from his mother within temple walls. She speaks of destiny, of burden, of a faith in crisis that only he can restore. Then she vanishes, leaving him alone with her words and nothing else. Years pass in poverty and struggle, but the boy never forgets. At sixteen, Rennyo leaves everything behind to pursue what his mother set in motion, traveling across medieval Japan to breathe life back into a Buddhism on the verge of collapse. What begins as a child's confused memory becomes a young man's consuming purpose. Along his journey, he encounters believers and skeptics, discovers the depths of his own conviction, and works to understand whether his mother's disappearance was abandonment or sacrifice. The film traces how personal loss transforms into spiritual mission, how a single moment between parent and child echoes across generations and reshapes an entire religious tradition. It's a story about faith born not from comfort but from void, about the weight of inherited purpose, and the long road between hearing a calling and becoming worthy of it.