Kishōtenketsu (起承転結) is a way of building a Chinese poem. The Nihon Kokugo Daijiten explains it with the four-line zekku . The first line is ki , the opening, the second shō , the development, the third ten , the turn, and the fourth ketsu , the conclusion. According to the encyclopedia Nihon Daihyakka Zensho, the structure matured in China around the eighth century.
It appears in Japanese school lessons. A 2021 lesson of the Sapporo board of education for second-year junior high school students explains it this way. The first line begins the poem, the second takes it up and develops it, the third changes the scene, and the fourth brings the whole to a close.