Shingon Buddhism
One Japanese branch of Mahayana Buddhism — Shingon Buddhism — makes frequent use of mandalas in its rituals as well, though the actual mandalas differ. When Shingon’s founder, Kukai, returned from his training in China, he brought back two mandalas that became central to Shingon ritual: the Mandala of the Womb Realm and the Mandala of the Diamond Realm.