[1] Motomasa wrote many plays, including Morihisa,[b] Sumida River,[c] Uta-ura, and Yoroboshi.

[2] Yoroboshi is a didactic play that encourages the audience to follow the mediation method of Pure Land Buddhism while the sun sets.

A deranged mother travels from the capital to eastern Japan in search of her kidnapped son, only to find his tomb.

Zeami argued that the ghost should not be shown to the audience as it is supposed to be visible only to the mother.

[2] The reason for the persecution of Zeami and Motomasa by the shoguns has long been a subject of speculation.

Zeami lamented his son's death in Museki Isshi (1433, A Page on the Ruin of a Dream).