In the Shinto religion, as it is considered that when the sanjyusankaiki is reached the aramitama (stormy spirit) changes to nigimitama (mild spirit) and to mioyanomitama (ancestor's spirit), the sanjyusankaiki is treated as a turning point.
また、神道では三十三回忌をもって荒御霊が和御霊（祖霊）になるとするため、三十三回忌を区切りとする。