You don't watch this to understand Buddhism as doctrine. You watch it to see a man realize his entire life's certainty was wrong, then rebuild everything from that breaking point. The animation strips away drama to let the silence work. What remains is Shinran's quiet refusal to look away from his own failure, and the strange peace that comes from accepting it completely.
A single-episode OVA from 2008 that recounts the biography of Shinran, who founded the Jodo Shinshu school. The animated account portrays the man behind that tradition, tracing his life from its beginning along the path that led him to become its founder.