Question: Magical girl is a subgenre found in which American animated television series first shown by Disney in 2015?
Context: Magical Girl Site (魔法少女サイト , Mahō Shōjo Saito ) is a Japanese magical girl horror "shōnen" manga series written and illustrated by Kentarō Satō.  The series is a spinoff of "Magical Girl Apocalypse", and has been published in "Champion Tap! " since July 2013.  It is also licensed by Seven Seas.  An anime television series adaptation is scheduled to air sometime in 2018. Magical Girl Lyrical Nanoha A's (魔法少女リリカルなのは エース , Mahō Shōjo Ririkaru Nanoha Ēsu ) ("A's" is pronounced as "Ace") is an anime television series produced by Seven Arcs.  It is the second anime in the "Magical Girl Lyrical Nanoha" franchise, following the previous series.  The series aired in Japan between October 1, 2005 and December 25, 2005 and was licensed in North America by Geneon.  A film adaptation, "Magical Girl Lyrical Nanoha: The Movie 2nd", was released in Japanese theaters on July 14, 2012.  The series has also spawned a manga accompaniment and two video game adaptations for the PlayStation Portable.  It was succeeded by "Magical Girl Lyrical Nanoha StrikerS" in 2007. Star vs. the Forces of Evil is an American animated television series produced by Disney Television Animation.  The first episode was shown on January 18, 2015, on Disney Channel as a special preview, and the series officially premiered on March 30, 2015, on Disney XD.  The show was created by Daron Nefcy, who had worked on storyboards for "Wander Over Yonder" and "Robot and Monster".  Nefcy became the second woman to create an animated series for Disney Television Animation (the first being Sue Rose, who created "Pepper Ann"), and the first woman to create a Disney XD series.  On February 12, 2015, Disney renewed the series for a second season prior to its premiere on Disney XD.  The second season premiered on July 11, 2016.  On March 4, 2016, it was renewed for a third season, with a two-hour TV movie called "The Battle for Mewni", which aired on July 15, 2017.  On February 28, 2017, it was officially renewed for a fourth season. Magical Girl Pretty Sammy (魔法少女プリティサミー , Mahō Shōjo Puriti Samī ) is a Japanese original video animation (OVA) series produced by AIC, and released from 1995 to 1997 as three videos.  It features character Sasami from the "Tenchi Muyo! " series as a magical girl, and is noted for recasting the "Tenchi Muyo!"  characters in new roles.  It has been dubbed into English by Pioneer USA.  It also spawned two television series: "Magical Project S", and "", the latter of which recasts the characters another time. "Magical Girl Lyrical Nanoha" is a fantasy adventure anime and manga series written by Masaki Tsuzuki.  Set in a fictional universe, its storyline follows several different users of magic as they become involved with incidents related to powerful ancient artifacts.  Four anime series have been produced by Seven Arcs between 2004 and 2009 with music direction by Toshiki Kameyama.  The first season anime television series titled "Magical Girl Lyrical Nanoha" directed by Akiyuki Shinbo was broadcast in 2004 spanning thirteen episodes.  The second season of the anime series titled "Magical Girl Lyrical Nanoha A's" directed by Keizō Kusakawa was broadcast in 2005 spanning thirteen episodes.  A third season of the anime series titled "Magical Girl Lyrical Nanoha StrikerS" directed by Keizō Kusakawa was broadcast in 2007 spanning twenty-six episodes.  An anime film readaptation of the first season of the anime series was released in 2010.  The discography for these series consist of ten soundtrack albums, three compilation albums, nine maxi singles, one studio album, and fourteen drama CDs. Magical Girl Lyrical Nanoha (魔法少女リリカルなのは , Mahō Shōjo Ririkaru Nanoha ) is a Japanese multimedia franchise that encompasses five anime television series, three theatrical adaptations, multiple manga and Drama CD adaptations and sequels, as well as model figures and plastic models.  It began in 2004 with "Magical Girl Lyrical Nanoha", an alternate universe spin-off of the "Triangle Heart" series, and is on-going to date. Magical girls (魔法 少女 , mahō shōjo , also known as mahou shoujo or majokko) is a subgenre of Japanese fantasy anime and manga which feature girls who use magic.  Although the genre has origins in Japan, it has been used as a motif outside Japan in Western works such as "", "Star vs. the Forces of Evil", "Steven Universe", "Winx Club" and "W.I.T.C.H.". Lalabel, also known as Lalabel, The Magical Girl (魔法少女ララベル , Mahō Shōjo Raraberu ) or Magical Girl Lalabel, is a magical girl anime television series by Toei Animation.  It aired from 15 February 1980 to 27 February 1981 on TV Asahi. Miracle Girl Limit-chan (ミラクル少女リミットちゃん , Mirakuru Shōjo Rimitto-chan ) is a Japanese magical girl anime television series consisting in 25 episodes.  It was directed by Takeshi Tamiya and Masayuki Akehi, and it was first broadcast on TV Asahi (then NET) in 1973.  Based on an original story by Shinji Nagashima and Hiromi Productions, the series featured character designs by Kazuo Komatsubara and scripts by Masaki Tsuji.  It is the sixth of Toei Animation's original "majokko" (magical girl) anime series, although, as with "Cutie Honey", the title character's powers are derived from science rather than magic. Magical Girl Lyrical Nanoha (魔法少女リリカルなのは , Mahō Shōjo Ririkaru Nanoha ) is a Japanese anime television series directed by Akiyuki Shinbo, with screenplay written by Masaki Tsuzuki, and produced by Seven Arcs.  It forms part of the "Magical Girl Lyrical Nanoha" series.  The Japanese Association of Independent Television Stations broadcast 13 episodes between October and December 2004.  The series is a spin-off of the "Triangle Heart" series and its story follows a girl named Nanoha Takamachi who decides to help a young mage named Yūno to recover a set of 21 artifacts named the "Jewel Seeds".
Answer: Star vs. the Forces of Evil