Icha Icha

is a series of adult novels written by Jiraiya after the commercial failure of The Tale of the Utterly Gutsy Shinobi. The Icha Icha novels are based on Jiraiya's experiences in love, particularly his rejections by Tsunade. When he's working on a new novel, he gathers "research" by peeping on women while they bathe. Icha Icha is wildly popular, giving Jiraiya's checkbook a balance that is "filled with zeroes". Kakashi Hatake is a particular fan of the series; he enjoys reading the books even while in the middle of conversations.

Known Books

 * is the first in the series, written in three parts. Its plot is summarised as: "The main character and heroine, both new to love, begin dating, and their eyes gradually open to grown-up love." In Gaara Hiden, Gaara reads Paradise in an effort to learn more about relationships, but it only ends up making him more confused. Paradise eventually receives a film adaptation; in Konoha Shinden, it was filmed in a town in the Land of Fire, near the border with the Land of Hot Water. When Mirai Sarutobi asks Might Guy what the film is about, he becomes uncomfortable and abruptly changes the subject.
 * is the second book in the series. Ebisu enjoyed Violence more than Paradise, remarking that, "I have never seen the bonds between a man and a woman painted so stirringly." In Naruto episode 101, Violence also receives a film adaptation.
 * is the follow-up to Violence. When asked about it during an interview, Jiraiya says that he's still in the research phase of writing it, but that it will be about pure love.
 * is the first book to be published after a three year hiatus. Naruto Uzumaki gives Kakashi an advance copy, which he describes as "totally boring". It also used as a weakness during the bell test Kakashi gives them; Jiraiya feels that Naruto is simply too young to appreciate it. Prior to his death, Jiraiya uses Tactics as the key for a secret message about Pain's identity. In order to decode the message, Kakashi is forced to read passages aloud; Kakashi is embarrassed to do so, and Shikamaru Nara is embarrassed to listen. In Naruto Shinden: Parent and Child Day, Kakashi encourages Sasuke Uchiha to imitate scenes from Tactics to help him become closer with his daughter, Sarada. Afterwards, when the various ideas of the book backfired to make Sarada storm off annoyed, Kakashi determined that the book's depictions maybe outdated for someone of Sarada's age. The story is actually separated into multiple volumes, in which the ending in the fifth one was so intense that readers tended to pass out, leading to it being removed after the first edition; Yubeshi had a first edition copy, and used it as leverage against Kakashi in order to have him help sort out her family issues.

Trivia

 * On the cover page of Naruto chapter 531, Kakashi is holding a book titled.
 * In Naruto episode 177, Naruto ghost-writes an Icha Icha book in an attempt to force Jiraiya to train him. The manuscript is mistakenly sent to the Land of Fangs' daimyō as a peace treaty. The daimyō enjoys it so much that he ends his country's war with the Land of Claws.
 * In Naruto the Movie: Ninja Clash in the Land of Snow, Koyuki Kazahana is implied to star in the film adaptation of Icha Icha Paradise.
 * In Naruto: Ultimate Ninja 3, a copy of Icha Icha Strap can be gifted to Ebisu.
 * In Naruto SD: Rock Lee no Seishun Full-Power Ninden, there are at various times mentions of Icha Icha Pooltime, Icha Icha Emotion, Icha Icha Dynamic, and Ero Ero Install.
 * In Boruto: Naruto Next Generations episode 37, Kakashi mentions he has Icha Icha Paradise memorised after reading the book for so many years.
 * In Boruto: Naruto Next Generations episode 127, Boruto Uzumaki, Sarada Uchiha, and Chōchō Akimichi try to get a copy of the book only for adults to interfere every time, insisting they're too young to read the book. Naruto is shown to have several copies of the entire series in his home's bookshelf, which Hinata took away when Boruto tried to read them.