Angel Has Fallen is the final book in the Sea of Plenty tetralogy. The main character, Shigekuni Honda, old and lonely, meets a sixteen-year-old teenager on his life's journey. Obsessed with the mystery of the circle of life, Honda wants to see it as the rebirth of the Thai princess. Honda adopts a teenager and intends to educate him, but reality mercilessly destroys his illusions. The basis of the plot of Yukio Mishima’s tetralogy “Sea of Plenty” is a story that truly embodies the Buddhist concept of the cycle of human existence. The transmigration of the soul, the rebirth in a new bodily shell of a young man named Kiyoaki, who died at the age of twenty, has been observed throughout his long life by his classmate and friend Honda.