Icha Icha (イチャイチャ, Icha Icha) is a series of best-selling novels written by Jiraiya. Little is known about the novel's plot, but it is noted to be about a passionate love between a man and a woman. Kakashi Hatake is a big fan of the series and is shown reading one of them most of the time. They are comedic (and likely adult) recounts of Jiraiya's experiences in love. They are meant for people of 18 and above.
- Icha Icha Paradise (イチャイチャパラダイス, Icha Icha Paradaisu, English TV: Make-Out Paradise): The first book to appear in the series.
- Icha Icha Tactics (イチャイチャタクティクス, Icha Icha Takutikusu, English TV: Make-Out Tactics): The third book.
- Icha Icha Pooltime (イチャイチャプール間き, Icha Icha Pūrukanki, English TV: Make-Out Pooltime): The first book in a Swimming sub-series, as seen in episode 5.
- Icha Icha Emotion (イチャイチャエモーション, Icha Icha Emōshon, English TV: Make-Out Emotion)
- Icha Icha Dynamic (イチャイチャダイナミック, Icha Icha Dainamikku, English TV: Make-Out Dynamic)
- Ero Ero Install (エロエロインストール, Icha Icha Insutōru, English TV: Make-Out Install)