Key is a Japanese visual novel video game development studio and brand under the publisher Visual Arts. The video games developed by Key are initially published by Visual Arts and released for Windows; consumer ports are published by Interchannel and Prototype. Key released their debut title, Kanon, in 1999, followed by their second title, Air, in 2000. Both Kanon and Air were initially released as adult games, but Key released their third game, Clannad, in 2004 with a rating of approval for all ages. Key's fourth game, Planetarian: The Reverie of a Little Planet, was also released in 2004 with a rating for all ages, and is described as a "kinetic novel" by the development team because of its completely linear storyline.

Key's fifth game, Tomoyo After: It's a Wonderful Life, was released in 2005 as an adult game and spin-off from Clannad; it expanded on the scenario of the heroine Tomoyo Sakagami. Key released their sixth visual novel, Little Busters!, in 2007 with a rating for all ages. Key's seventh title, Little Busters! Ecstasy, was an expanded, adult version of Little Busters! released in 2008. Key's eighth game, Kud Wafter, was released in 2010 as an adult game and spin-off from Little Busters! Ecstasy; it expanded on the scenario of the heroine Kudryavka Noumi. Key released their ninth game Rewrite in 2011 with a rating for all ages. Key released a fan disc of Rewrite titled Rewrite Harvest festa! in 2012.

Key's 11th game Angel Beats! 1st Beat was released in 2015. Key released the kinetic novel Harmonia in 2016. Key's 13th game Summer Pockets was released in 2018, and an expanded version titled Summer Pockets Reflection Blue was released in 2020. Three kinetic novels were released in 2021: Loopers, Planetarian: Snow Globe and Lunaria: Virtualized Moonchild. Another kinetic novel, Stella of The End, followed in 2022. A four-volume kinetic novel series for the Prima Doll multimedia project will be released between 2023 and 2024.

As of September 2022, 62 versions of Key's 18 released visual novels have been published by VisualArt's. Of the 62, 11 were released with an adult rating, and the remaining 51 had a rating for all ages. VisualArt's has ceased manufacturing 40 versions of Key's 18 games. Key released a box set called "Key 10th Memorial Box" in July 2009 containing six of Key's visual novels with a rating for all ages. The availability of Key 10th Memorial Box was restricted to ordering online. Key released "memorial editions" of their first five games in April and May 2010 with ratings for all ages.

Visual novel list

Windows

Visual novel release history

Title	Version	Release date	Rating	Status	WW
Kanon	Kanon (limited edition)	June 4, 1999	Adult	Discontinued
	Kanon (regular edition)	June 4, 1999	Adult	Discontinued
	Kanon (all ages edition)	January 7, 2000	All ages	Discontinued
	Kanon Standard Edition	November 26, 2004	Adult	Discontinued
	Kanon Standard Edition	January 28, 2005	All ages	Discontinued
	Kanon	July 31, 2009	All ages	Discontinued
	Kanon (all ages memorial edition)	April 30, 2010	All ages	Discontinued
Air	Air (limited edition)	September 8, 2000	Adult	Discontinued
	Air (regular edition)	July 27, 2001	Adult	Discontinued
	Air (all ages edition)	July 27, 2001	All ages	Discontinued
	Air Standard Edition	April 8, 2005	Adult	Discontinued
	Air	July 31, 2009	All ages	Discontinued
	Air (all ages memorial edition)	May 28, 2010	All ages	Discontinued
Clannad	Clannad (limited edition)	April 28, 2004	All ages	Discontinued
	Clannad (regular edition)	August 6, 2004	All ages	Discontinued
	Clannad Full Voice	February 29, 2008	All ages	Discontinued
	Clannad	July 31, 2009	All ages	Discontinued
	Clannad (all ages memorial edition)	May 28, 2010	All ages	Discontinued	Yes
Planetarian: The Reverie of a Little Planet	Planetarian: The Reverie of a Little Planet (Kinetic Novel edition)	November 29, 2004	All ages	Discontinued
	Planetarian: The Reverie of a Little Planet (package limited edition)	April 28, 2006	All ages	Discontinued
	Planetarian: The Reverie of a Little Planet (package regular edition)	April 28, 2006	All ages	Discontinued
	Planetarian: The Reverie of a Little Planet	July 31, 2009	All ages	Discontinued
	Planetarian: The Reverie of a Little Planet (all ages memorial edition)	April 30, 2010	All ages	Discontinued	Yes
	Planetarian: The Reverie of a Little Planet (English edition)	March 28, 2015	All ages	Discontinued
	Planetarian: The Reverie of a Little Planet (HD edition)	July 29, 2016	All ages	Available	Yes
	Planetarian Ultimate Edition	September 3, 2021	All ages	Available
Tomoyo After: It's a Wonderful Life	Tomoyo After: It's a Wonderful Life (limited edition)	November 25, 2005	Adult	Discontinued
	Tomoyo After: It's a Wonderful Life	July 31, 2009	All ages	Discontinued
	Tomoyo After: It's a Wonderful Life (all ages memorial edition)	April 30, 2010	All ages	Discontinued	Yes
	Tomoyo After: It's a Wonderful Life Perfect Edition	September 26, 2014	Adult	Available
Little Busters!	Little Busters! (limited edition)	July 27, 2007	All ages	Discontinued
	Little Busters! (regular edition)	September 28, 2007	All ages	Discontinued
Little Busters! Ecstasy	Little Busters! Ecstasy (limited edition)	July 25, 2008	Adult	Discontinued
	Little Busters! Ecstasy (regular edition)	September 26, 2008	Adult	Available
	Little Busters! Ecstasy	July 31, 2009	All ages	Discontinued
	Little Busters! Perfect Edition	November 30, 2012	All ages	Discontinued	Yes
Kud Wafter	Kud Wafter	June 25, 2010	Adult	Available
	Kud Wafter (all ages edition)	June 28, 2013	All ages	Discontinued
Rewrite	Rewrite (limited edition)	June 24, 2011	All ages	Discontinued
	Rewrite (regular edition)	September 30, 2011	All ages	Discontinued
	Rewrite+	July 29, 2016	All ages	Available	Yes
Rewrite Harvest festa!	Rewrite Harvest festa!	July 27, 2012	15+	Available	To be released
Angel Beats! 1st Beat	Angel Beats! 1st Beat	June 26, 2015	All ages	Available
Harmonia	Harmonia (English edition)	September 23, 2016	All ages	Available	Yes
	Harmonia (Japanese edition)	December 29, 2016	All ages	Available
	Harmonia (limited edition)	May 26, 2017	All ages	Discontinued
	Harmonia (regular edition)	April 26, 2019	All ages	Available
Summer Pockets	Summer Pockets (limited edition)	June 29, 2018	All ages	Discontinued
	Summer Pockets (regular edition)	July 26, 2019	All ages	Discontinued	Yes
Summer Pockets Reflection Blue	Summer Pockets Reflection Blue (limited edition)	June 26, 2020	All ages	Available
	Summer Pockets Reflection Blue (special edition)	June 26, 2020	All ages	Discontinued
Loopers	Loopers (download edition)	May 28, 2021	All ages	Available	Yes
	Loopers (limited edition)	May 28, 2021	All ages	Available
	Loopers (special edition)	May 28, 2021	All ages	Discontinued
Planetarian: Snow Globe	Planetarian: Snow Globe (download edition)	September 3, 2021	All ages	Available
	Planetarian: Snow Globe (package edition)	September 3, 2021	All ages	Available
Lunaria: Virtualized Moonchild	Lunaria: Virtualized Moonchild (download edition)	December 24, 2021	All ages	Available
	Lunaria: Virtualized Moonchild (limited edition)	December 24, 2021	All ages	Available
	Lunaria: Virtualized Moonchild (special edition)	December 24, 2021	All ages	Available
Stella of The End	Stella of The End (download edition)	September 30, 2022	All ages	Available	Yes
	Stella of The End (limited edition)	September 30, 2022	All ages	Available
	Stella of The End (special edition)	September 30, 2022	All ages	Available
Prima Doll	Prima Doll: Fuyuzora Hanabi / Sekka Monyō	April 28, 2023	All ages	Available
	Prima Doll: Mumei Tenrei	May 31, 2024	All ages	To be released
	Prima Doll: Kōto Tantei	2024	All ages	To be released
	Prima Doll Encore	2024	All ages	To be released

Consumer ports

Consumer ports release history

Title	First release date	Publisher(s)	CERO rating(s)	Android	DC	FOMA	iOS	PS2	PS3	PS4	PSP	PSV	S3G	Switch	XB360
Kanon	September 14, 2000 (DC)	NEC Interchannel Prototype	B	Yes	Yes	Yes	Yes	Yes			Yes		Yes	Yes
Air	September 20, 2001 (DC)		B (DC, PS2) C (PSP, PSV, Switch)	Yes	Yes	Yes	Yes	Yes			Yes	Yes	Yes	Yes
Clannad	February 23, 2006 (PS2)	Interchannel Prototype	C	Yes		Yes		Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Planetarian: The Reverie of a Little Planet	August 24, 2006 (PS2)	Prototype Visual Arts	A	Yes		Yes	Yes	Yes			Yes		Yes	Yes
Tomoyo After: It's a Wonderful Life CS Edition	January 25, 2007 (PS2)		B	Yes		Yes		Yes	Yes		Yes			Yes	Yes
Little Busters! Converted Edition	December 24, 2009 (PS2)		B					Yes	Yes		Yes	Yes		Yes
Kud Wafter Converted Edition	January 31, 2013 (Android)		C	Yes							Yes	Yes		Yes
Rewrite	April 17, 2014 (PSP)		C						Yes	Yes	Yes	Yes
Rewrite Harvest festa!	May 18, 2017 (PSV)		D									Yes
Summer Pockets	December 17, 2018 (iOS)		C	Yes			Yes							Yes
Summer Pockets Reflection Blue	August 20, 2020 (Android)		C	Yes			Yes			Yes				Yes
Loopers	July 20, 2021 (Android, iOS)		B	Yes			Yes			Yes				Yes
Heaven Burns Red	February 10, 2022 (Android, iOS)	Wright Flyer Studios		Yes			Yes
Lunaria: Virtualized Moonchild	February 24, 2022 (Android, iOS)	Visual Arts		Yes			Yes							Yes
Harmonia	October 20, 2022 (Switch)	Prototype	B											Yes
Stella of The End	April 21, 2023 (Android, iOS)	Visual Arts		Yes			Yes