Icha Icha

is a series of best-selling novels written by Jiraiya. Kakashi Hatake is a big fan of these books, and is seen reading one of them most of the time. They are comedic (and likely adult) recounts of Jiraiya's experiences in love.

Known books

 * The first book to appear in the series. It was so famous that it was made into a movie. It is believed that Koyuki Kazahana from the first Naruto movie starred in this movie.
 * The second book. Also became a movie, as seen in episode 101.
 * The third book. Naruto Uzumaki gives this book to Kakashi when he returns to Konoha after a two-and-a-half year absence. It was the newest installment in several years. When Jiraiya sends the secret to Pain's identity to Konoha, he uses the first word from various pages in the book to decode his message. The resulting message is: "The real one isn't with them."
 * Make-Out Strap: A book only seen in the game Naruto: Ultimate Ninja 3 that can be given to Ebisu.
 * There's also an unofficial Icha Icha novel written by Naruto Uzumaki in episode 177. When Naruto finishes Jiraiya's manuscript (so that Jiraiya would train him again) and accidentally sends it to the wrong place (Land of the Fang). The book is mistaken for a peace treaty, and since the daimyo enjoyed it he ended with war with the Land of the Claw.