Tsuyokiss is about the lives of a group of fictional high school students and the often comedic events that occur in their lives. The main protagonist is an average boy named Leo Tsushima who is secretly in love with the eldest daughter of the Kiriya Corporation and who is the student council president - Erika Kiriya.
Later, a senior female student, Otome Kurogane, knocks out several of the main characters one day when they are trying to sneak into school after being late. Surprisingly, it turns out that she is Leo's beloved cousin that he had not seen for years. Suddenly, Otome decides to move into the same house as Leo, whose mediocre life is changing into something a bit more exciting. In the PlayStation 2 version, Leo begins to form relations with Sunao Konoe who is an old acquaintance.
Tsuyokiss Nigakki is the sequel to Tsuyokiss where Leo was not in love to anyone in the first term. At the beginning of the second term, Leo has been worried about what to do after graduation because he does not know what his dream is. Then, Serebu Tachibana transfers to his class and she sits down next to him.
Tsuyokiss Sangakki is the sequel to Tsuyokiss Nigakki where Leo was not in love with anyone during the first or second term.
The anime version's plot of Tsuyokiss differs from that of the video game's in that Sunao Konoe is the main protagonist of the story. Sunao, who finds out the school she transfers to does not have a drama club, becomes determined to form a drama club. Her main obstacle is having to prove to the student council president, Erika Kiriya, that forming a drama club would be worth her time which causes Erika to constantly offer challenges to Sunao for which she must pass in order for the club to be formed.
Characters from the Tsuyokiss visual novel appear in the anime. Leo Tsushima, the protagonist of the visual novel, is also the main male protagonist of the anime.
Sunao Konoe (近衛素奈緒, Konoe Sunao)
Leo Tsushima (対馬レオ, Tsushima Reo)
Nagomi Yashi (椰子なごみ, Yashi Nagomi)
Shizuka Asada (浅田静香, Asada Shizuka)
Noriko Nishizaki (西崎紀子, Nishizaki Noriko)
Youhei Murata (村田洋平, Murata Youhei)
Erika Kiriya (霧夜エリカ, Kiriya Erika)
Yoshimi Satou (佐藤良美, Satō Yoshimi)
Kinu Kanisawa (蟹沢きぬ, Kanisawa Kinu)
Shinichi Samesuga (鮫氷新一, Samesuga Shinichi)
Subaru Date (伊達スバル, Date Subaru)
Otome Kurogane (鉄乙女, Kurogane Otome)
Inori Ōeyama (大江山祈, Ōeyama Inori)
Heizou Tachibana (橘平蔵, Tachibana Heizou)
Honoka Konoe (近衛ほのか, Konoe Honoka)
Tsuchinaga (土永)
Tsuyokiss's first appearance was in the form of a visual novel video game for the PC developed by Candy Soft and released on August 26, 2005. Like many games in this genre, it was first made as an eroge. Later, a PS2 version with no sexual content was developed. It was released on August 1, 2006, entitled Tsuyokiss ~Mighty Heart~. On December 15, 2006, Minikiss ~Tsuyokiss Fan Disc~ was released by Candy Soft.
The sequel entitled Tsuyokiss Nigakki to Tsuyokiss was developed by Candy Soft and went on sale on April 25, 2008. Its scenario was written by NOB because Takahiro, who is a director and a scriptwriter of Tsuyokiss, left Candy Soft. It was first made as an H-game too. Later, it was transplanted into PlayStation 2 and PlayStation Portable by Revolution without erotic elements. PlayStation 2 version entitled Tsuyokiss Swift Love was on sale on July 30, 2009, PlayStation Portable version entitled Tsuyokiss -Portable- was put on the market on October 28, 2010.
Tsuyokiss Sangakki for the PC was developed by Candy Soft on March 31, 2011. Its scenario writers are Sakaki Kasa and Kizoku Kumagawa who are outsourcers.
The Tsuyokiss Cool×Sweet anime started airing in Japan on July 1, 2006 with a total of 12 episodes. In the R2 DVD release, each episode has extended footage at the middle of every episode, where a short (2 minutes) sketch featuring some or all of the characters is presented.
The manga version, illustrated by Hamao Sumeragi and based on the videogame version, began serialization in the Comp Ace on January 26, 2006 in Japan, published by Kadokawa Shoten. The manga was collected in two tankōbon volumes.
Four novels based on the PS2 version and fifteen adult novels based on the PC version or Minikiss version were published by five publishers in Japan.
One fanbook for the PC version and one guidebook for the PS2 version were published in Japan.
Four drama CDs based on the videogame were released by Softgarage. Seven character image song albums based on the PS2 version were released by Five Records. A soundtrack and Character image song album named Tsuyokiss ~Cool×Sweet~ Complete Selection based on the anime version was released by SOL BLADE/Tree Fat Samurai.
The anime series was released in six DVDs by Trinet Entertainment in Japan.
The original Tsuyokiss game was voted the 14th most interesting galge ever by readers of Dengeki G's Magazine in an August 2007 survey.14 The PC release was the top-selling bishoujo game in Japan from August 16 to September 15 of 2006.1516
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Tsuyokiss Official Fanbook. Ohzora Publishing. 2006. p. 138. ISBN 4-7767-9262-1. 4-7767-9262-1 ↩
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"Candy Soft site". Retrieved September 3, 2010. http://www.candysoft.jp/ohp/01_products/minikiss/minikiss_/chara/chara_main.html#konoe ↩
"Candy Soft site". Retrieved September 3, 2010. http://www.candysoft.jp/ohp/01_products/tsuyokiss2/chara/sunao/sunao.html ↩
"Candy Soft site". Retrieved February 22, 2011. http://www.candysoft.jp/ohp/01_products/tuyokiss3/main_chg.html ↩
"GamePlaza-HARUKA- 声優さん出演リスト タイトル別表示 つよきす2学期". Archived from the original on 2012-06-07. Retrieved 2013-01-27. https://web.archive.org/web/20120607112950/http://gph.sakura.ne.jp/va_memo/system/vadb.cgi?action=view_title&value=%A4%C4%A4%E8%A4%AD%A4%B92%B3%D8%B4%FC&mvalue=%A4%AD%A4%E3%A4%F3%A4%C7%A4%A3%A4%BD%A4%D5%A4%C8&hvalue=PC%A1%CA18%B6%D8%A1%CB ↩
"netrevo". Retrieved September 3, 2010. http://www.netrevo.net/products/tsuyokiss2/about.html ↩
"読者が選ぶ MY BEST ギャルゲーランキング" [Readers Choose My Best Galge Rankings] (in Japanese). Dengeki G's Magazine. Archived from the original on 2007-10-11. Retrieved 2013-02-15. https://web.archive.org/web/20071011213916/http://gs.dengekinet.com/ranking/index.html ↩
"PEAKS PCnewsWEB - Japanese Bishoujo Game Sales 8-16 to 8-31, 2006" (in Japanese). Archived from the original on 2005-12-22. Retrieved 2013-02-16. https://web.archive.org/web/20051222051119/http://www.peakspub.co.jp/ranking/rank178.html ↩
"PEAKS PCnewsWEB - Japanese Bishoujo Game Sales 9-1 to 9-15, 2006" (in Japanese). Archived from the original on 2006-06-29. Retrieved 2013-02-16. https://web.archive.org/web/20060629100542/http://www.peakspub.co.jp/ranking/rank179.html ↩