Normal version: The great fourth generation Hokage, Namikaze Minato, heroically sacrificed his life for the village. After his death, he met the Immortal of Six Paths. Realizing that his own abilities are insufficient, he trains in various worlds in order to meet his own son.
Twitch version: The twitchy Hokage went through various deeds to strengthen his strength in different worlds, and finally reunited with his son.
One sentence summarizes the full text: A certain boy's story of crawling around in different high-risk worlds.