Yashima is based on stories such as 'Yuminagashi,' which is a story in the Tale of the Heike, Vol.11, and the great performance of MINAMOTO no Yoshitsune and his retainers at the battle of Yashima as well as the suffering of the warlord who spent the afterlife in a hell known as Shurado (which is short for Ashurado: World of Fighting and Slaughter), are written in a flowing and elegant style.
平家物語の巻十一「弓流し」などから取材され、屋島の戦いにおける源義経主従の活躍と修羅道におちた武将の苦しみが流麗な文体で描かれている。