Buddha (Gotama Siddhattha), owing to the request from Vaidehi, the wife of Bimbisara, preached 13 sermons by meditating on Amida Buddha, the Land of Utmost Bliss, and the bodhisattvas Kannon and Seishi Bosatsu with the introductory part describing 'Oshajo no higeki' (Tragedy in Osahjo), in which a prince called Ajase (a king of Magadha, in India, during the time of Shakyamuni Buddha) was tempted by his bad companion Devadatta to have his own father Bimbisara confined and starved to death.
阿闍世という名の太子が、悪友の提婆達多にそそのかされて、父の頻婆娑羅王を幽閉し餓死させようとした「王舎城の悲劇」を導入部として、王の后である韋提希夫人の願いにより釈迦が、極楽世界や阿弥陀仏、観音菩薩・勢至菩薩の二菩薩を観想する13の観法を説かれる。