Shinran Shounin to Ousha-jou no Higeki
親鸞聖人と王舎城の悲劇Shinran Shounin to Ousha-jou no Higeki
The story
OVAAn spinoff of Sekai no Hikari: Shinran Shounin. It covers the life of Shinran Shounin and his involvement to develop the Mahayana Buddism branch.
(Source: Wikipedia)