I’m reading TV Tropes

[feotakahari]

“Jiraiya Gouketsu Monogatari, a 19th century poem . . . Jiraiya was a deposed prince who learned ninjitsu and Yamabushi magic under the frog sage Senso Dojin alongside his love Tsunade (a student of Slug Magic), to defeat his student-turned-snake-sorcerer Orochimaru and stop his plan to conquer all of Japan and eventually the world.”

Holy shit I did not know that reference.