0verflow developed several visual novels related to School Days, sharing the same universe. Prior to the development of School Days, 0verflow developed the Radish Vacation visual novel series. The first was Snow Radish Vacation released on December 28, 2001, followed by Summer Radish Vacation on April 1, 2003, and finally Summer Radish Vacation 2 on August 13, 2004.[60]
A prequel titled Summer Days, was released on June 23, 2006, retelling the original game during summer vacation and from the perspective of Setsuna Kiyoura.[61] However, unlike its predecessor, Summer Days was almost universally panned for its heavily bugged state,[62] loads of patches,[63] and recall.[64] Another spin-off titled Cross Days was released on March 19, 2010. Set in the same continuity as School Days, Cross Days follows the life of another protagonist, Yuuki Ashikaga, a high school freshman who also finds himself caught between the affection of two girls, Roka Kitsuregawa and Kotonoha Katsura, during his second term at Sakakino Academy. The game also features yaoi scenarios, during which Yuuki cross-dresses as a maid.[65][66] 0verflow released Shiny Days on February 2, 2012, which is a remastered version of Summer Days with a new heroine and higher quality animations. A spin-off, Island Days, was developed for the Nintendo 3DS and was released in Japan on July 3, 2014. The game, developed by Klon, focuses on Makoto and the girls becoming trapped on a remote island and includes tower defense elements.[67]
Manga
Based on the story of the original game, School Days was reimagined as a manga, illustrated by Homare Sakazuki and serialized in the Kadokawa Shoten magazine Comp Ace from May 26, 2006[68] to September 26, 2007.[69] On July 12, 2007,[70] 0verflow announced that the manga had been collected into its first volume, comprising five chapters set to be released on July 24.[71] Later that year, the second and final volume, comprising the remaining seven chapters, was released on November 21.[72]
Various artists also produced short manga of School Days that were compiled into two comic anthologies. The "School Days Comic Anthology" was released by Ohzora Publishing
Books and publications
In addition to the manga, School Days was adapted into other print media. The first of these was the "School Days Visual Guide Book" published by Jive on September 16, 2005,[76] an artbook of character illustrations, model sheets, screenplay, storyboards, and a visual hierarchy of the choices and corresponding scenes in the game.[77] Separate editions for the anime television series and Playstation 2 game were also published, on December 1, 2007[78] and March 21, 2008, respectively.[79] Collections of production work from the Windows game such as character and environment art, screenplay, artist commentaries and all manufactured promotional items were collected in the "School Days Official Visual Artworks" (School Days 公式ビジュアル・アートワークス) on December 16, 2005[80]
Anime
School Days was adapted into a twelve-episode anime television series by TNK.[86] Concrete news of this first appeared on June 1, 2007,[87] when 0verflow announced via its blog that the show's official website had gone live.[88] Stations participating in the broadcast included TV Kanagawa, Chiba TV, TV Aichi, TV Osaka, TV Saitama and AT-X, the premiere of which would air on TV Kanagawa on July 3.[89] The anime was aired until September 27 and finished its broadcast on AT-X.[90] From September 26, 2007, to February 27, 2008, the series was compiled into six limited and regular edition DVDs
Delay of the finale
On September 17, 2007, the day before the twelfth and final episode of the televised anime was to air on TV Kanagawa, a sixteen-year-old girl murdered her forty-five-year-old father in their Kyoto home with an axe. TV Kanagawa promptly cancelled the Tuesday airing of the finale for its similarly violent content, replacing it instead with a thirty-minute video compilation of scenery footage from Europe including Norway, played to August Wilhelmj's "Air on the G String". Newspapers such as The Japan Times and Mainichi Shimbun reported on the killing and episode preempt on September 19.[95][96] According to Mainichi Shimbun, Chiba TV and TV Aichi had also cancelled their airings, with AT-X the only station remaining indecisive.[95] 0verflow issued an apology through their blog the same day,[87] asking viewers to stay tuned for updates.[97] In the following week, 0verflow announced that it had arranged for two screenings of the edited finale at the
Concert film
Besides the video releases of the School Days anime, a concert film, the School Days Secret Live DVD, was also produced by HOBiRECORDS.[108] Released on June 26, 2006, in conjunction with Summer Days,[109] the film contains footage of a concert held on June 15, 2005[110] featuring the performances of Miyuki Hashimoto, YURIA, rino, yozuca* and Minami Kuribayashi.[108]
Audio CDs
From 2005 to 2010, Lantis published six albums of School Days music. The "School Days Vocal Album", a compilation featuring all nine of the game's closing themes, as performed by artists Kiriko, Yozuca*, Miyuki Hashimoto, Yuria, Halko Momoi, Minami Kuribayashi, Rino, and Kanako Ito[111] was the first to be distributed, sharing its April 28, 2005, date with the release of the game itself. The remaining twenty-eight background scores, composed by KIRIKO/HIKO Sound, were released on July 21, officially completing the game's soundtrack.[112] Another compilation, the "School Days Vocal Complete Album [sic]" featuring songs from Summer Days and Cross Days, was released on October 8, 2010.[113]
Three weeks after the premiere of the televised anime on July 25, 2007, Lantis published the single "Innocent Blue" by DeviceHigh, a four-track disc featuring the anime opening of the same name, a disco-inspired song called Dancin' Joker, and their instrumentals.[114]
Merchandise
Considerable effort was made to market and promote School Days before and after its release, including the sale of brand merchandise and use of incentives. Through public venues and through the company's online store, 0verflow sold brand keystraps, mousepads, phonecards, book covers, mugs, t-shirts,[124] dakimakura cases, PVC figures,[125] lanyards, business card holders and cosplay material such as the girls' school uniforms and plastic dōzuki.[126]