Novels

Generally, books in the franchise fall under one of two categories: the light novel continuity, and the anime novelizations. There may be one or two mini novels that come packaged with CDs, but generally they aren't as frequent. All official books are published under Kadokawa, but the light novel continuity as well as the album-exclusive novels are published under Kadokawa Beans Bunko while the anime novelizations barring Kono Sekai no Tanoshimikata are published under Kadokawa Tsubasa Bunko.

The Kokuhaku series is a light novel series by HoneyWorks and several authors. The novels were primarily written by Touko Fujitani until Kinyoubi no Ohayou, and Mari Kousaka starting with Heart no Shuchou. 2020 introduced the Kokuhaku Jikkou Iinkai Idol Series, which takes place in the same continuity and remains written by Kousaka.

The Anime novelizations are also penned by Kousaka. Like the anime they're based off of, they have many similarities with the original works, but there are a few changes present.

Main Series

Kokuhaku Yokou Renshuu
Main Article	Kokuhaku Yokou Renshuu (novel)
Cover Character	Natsuki Enomoto Yu Setoguchi
Pages	245
Release Date	Japanese: 21 January 2014
ISBN	Japanese: 10: 4041012031 13: 978-4041012031

Yakimochi no Kotae
Main Article	Kokuhaku Yokou Renshuu: Yakimochi no Kotae
Cover Character	Sota Mochizuki Akari Hayasaka
Pages	246
Release Date	Japanese: 31 May 2014
ISBN	Japanese: 10: 4041015774 13: 978-4041015773

Hatsukoi no Ehon
Main Article	Kokuhaku Yokou Renshuu: Hatsukoi no Ehon
Cover Character	Miou Aida Haruki Serizawa
Pages	249
Release Date	Japanese: 31 October 2014
ISBN	Japanese: 10: 4041015782 13: 978-4041012031

Ima Suki ni Naru.
Main Article	Kokuhaku Yokou Renshuu: Ima Suki ni Naru.
Cover Character	Kotaro Enomoto Hina Setoguchi Koyuki Ayase
Pages	264
Release Date	Japanese: 01 July 2015
ISBN	Japanese: 10: 4041025117 13: 978-4041025116

Koi-Iro ni Sake
Main Article	Kokuhaku Yokou Renshuu: Koi-Iro ni Sake
Cover Character	Haruki Serizawa Miou Aida Natsuki Enomoto Yu Setoguchi Sota Mochizuki Akari Hayasaka
Pages	274
Release Date	Japanese: 31 March 2016
ISBN	Japanese: 10: 4041038391 13: 978-4041038390

Kinyoubi no Ohayou
Main Article	Kokuhaku Yokou Renshuu: Kinyoubi no Ohayou
Cover Character	Sena Narumi Midori Hamanaka
Pages	276
Release Date	Japanese: 01 October 2016
ISBN	Japanese: 10: 4041025133 13: 978-4041025130

Heart no Shuuchou
Main Article	Kokuhaku Yokou Renshuu: Heart no Shuchou
Cover Character	Ken Shibasaki Arisa Takamizawa Kotaro Enomoto
Pages	264
Release Date	Japanese: 01 October 2017
ISBN	Japanese: 10: 404106113X 13: 978-4041061138

Ijiwaru na Deai
Main Article	Kokuhaku Yokou Renshuu: Ijiwaru na Deai
Cover Character	Arisa Takamizawa Ken Shibasaki
Pages	264
Release Date	Japanese: 01 November 2017
ISBN	Japanese: 10: 4041061180 13: 978-4041061183

Boku ga Namae wo Yobu Hi
Main Article	Kokuhaku Yokou Renshuu: Boku ga Namae wo Yobu Hi
Cover Character	Sota Mochizuki Akari Hayasaka
Pages	247
Release Date	Japanese: 01 October 2018
ISBN	Japanese: 10: 4041075106 13: 978-4041075104

Daikirai na Hazu Datta.
Main Article	Kokuhaku Yokou Renshuu: Daikirai na Hazu Datta.
Cover Character	Kotaro Enomoto Hina Setoguchi
Pages	243
Release Date	Japanese: 01 June 2019
ISBN	Japanese: 10: 4041083389 13: 978-4041083383

Nonfantasy
Main Article	Kokuhaku Yokou Renshuu: Nonfantasy
Cover Character	Aizo Hiyori Suzumi Yujiro
Pages	280
Release Date	Japanese: 01 December 2019
ISBN	Japanese: 10: 4041089646 13: 978-4041089644

Kokhaku Yokou Renshuu: Heroine Ikusei Keikaku
Main Article	Kokuhaku Yokou Renshuu: Heroine Ikusei Keikaku
Cover Character	Asuka Kaidō Kanata Ichigoya Hiyori Suzumi Aizo Yujiro
Pages	276
Release Date	Japanese: 01 January 2020
ISBN	Japanese: 10: 4041089654 13: 978-4041089651

Tokyo Summer Session
Main Article	Kokuhaku Yokou Renshuu: Tokyo Summer Session
Cover Character	Akari Hayasaka Sota Mochizuki Natsuki Enomoto Yu Setoguchi Haruki Serizawa Miou Aida
Pages	269
Release Date	Japanese: 1 September 2020
ISBN	Japanese: 10: 4041099943 13: 978-4041099940

Otome-domo yo.
Main Article	Otome-domo yo.
Cover Character	Karen Miura Kei Sumida Chisa Takano
Pages	292
Release Date	Japanese: 01 December 2021
ISBN	Japanese: 10: 4041120799 13: 978-4041120798

Idol Series

Romeo
Main Article	Kokuhaku Jikkou Iinkai - Idol Series: Romeo
Cover Character	Yujiro Aizo
Pages	292
Release Date	Japanese: 23 December 2020
ISBN	Japanese: 10: 4041107997 13: 978-4041107997

LOVE&KISS
Main Article	Kokuhaku Jikkou Iinkai Fantasia: LOVE&KISS
Cover Character	Yujiro Aizo
Pages	292
Release Date	Japanese: 1 November 2022
ISBN	Japanese: 10: 4041107997 13: 978-4041107997

List of Anime Novelizations

Zutto Mae Kara Suki Deshita.
Main Article	Anime Novelizations
Cover Character	Haruki Serizawa Yu Setoguchi Sota Mochizuki Koyuki Ayase Akari Hayasaka Natsuki Enomoto Miou Aida
Pages	190
Release Date	Japanese: 05 April 2016
ISBN	Japanese: 10: 404631589X 13: 978-4046315892

Suki ni Naru Sono Shunkan Wo.
Main Article	Anime Novelizations
Cover Character	Koyuki Ayase Hina Setoguchi Kotaro Enomoto
Pages	192
Release Date	Japanese: 05 December 2016
ISBN	Japanese: 10: 4046316470 13: 978-4046316479

Itsu Datte Bokura no Koi 10 wa Centi Datta.
Main Article	Anime Novelizations
Cover Character	Yu Setoguchi Akari Hayasaka Sota Mochizuki Natsuki Enomoto Haruki Serizawa Miou Aida
Pages	256
Release Date	Japanese: 15 January 2018
ISBN	Japanese: 10: 4046317590 13: 978-4046317599

Kono Sekai no Tanoshimikata ~Secret Story Film~
Main Article	Anime Novelizations
Cover Character	Yujiro Aizo
Pages	225 244 (paperback)
Release Date	Japanese: 26 December 2020 (digital) 01 January 2021 (paperback)
ISBN	Japanese: 10: 4041110483 13: 978-4041110485

Other Novels

Watashi, Idol Sengen
Main Article	Watashi, Idol Sengen (novella)
Cover Character	Sena Narumi Mona Narumi
Pages	105
Release Date	Japanese: 28 February 2018
ISBN	Japanese: N/A

Mister Darling
Main Article	Mister Darling (novella)
Cover Character	Yuusuke Narumi Ayako Narumi
Pages	107
Release Date	Japanese: 16 September 2020
ISBN	Japanese: N/A

Heart no Chikai
Main Article	Heart no Chikai (novella)	File:Chikai Novel.jpg
Cover Character	Arisa Takamizawa Karen Miura
Pages	107
Release Date	Japanese: 26 October 2022
ISBN	Japanese: N/A