The official website of the television anime of Hirotsugu Ryusen‘s She declared herself a pupil of the sage (Kenja no Deshi or Nanoru Kenja) the light novel series confirmed on Saturday that Shuta Aoi plays Cleos.
Cleos is a young rider who acts as a representative of Danblf, the veteran summoner and wise man who became the beautiful maiden Mira due to a number of circumstances. Cleos is also a skilled summoner and teacher at the Arkite Academy.
Seven seas licensed to both the light novel and the manga, and it describes the story:
Sakamori Kagami was one of the best players in VRMMO Ark Earth Online as Danblf, a veteran Summoner with the gravity to match his elite status. When he falls asleep while playing one day, he is transported to a world where the game is reality, but instead of his almighty avatar, he is stuck in the body of a pretty young girl! He can’t let anyone know that this cute little cutie is really Danblf, so he takes the name “Mira” and pretends to be Danblf’s disciple. If it comes out, he’ll never live it!
Nichika omori stars in the show as a disciple Mira.
Ayumu Murase expresses the character of Solomon. Funimation describes the character as “the king of the Arkite kingdom, and another playful character, just like [Danblf], in whom he has great confidence. In front of his subjects, Solomon acts like a worthy leader, but he’s actually quite a sympathetic person, cares about his kingdom, and generally spends his time dealing with geopolitical conflicts and dealing with monsters. ”
Other cast members include:
Yūko Natsuyoshi as Emera, the deputy leader of the sword-wielding elves
Yae Sakura like Frikka, a mage
Hiroki yasumoto as Asbal, a fighter in the Ekalrath Carillon guild
Junichi Saito as Zef, a scout from the Ekalrath Carillon guild
Kanomi Izawa as a tact 
Minami hinata like Luminaria
Yui Horie as Mariana, Danblf helper
Ayane sakura as Amaratte, the arch-necromancer of the Tower of Necromancy
Isao Sasaki like Danblf, the old form of Mira
Keitaro Motonaga (Jormungand the two seasons, Date A live first three seasons) directs the anime to A-Chat Studio. Takamitsu Kouno (Utawarerumono: The false faces, Absolute Duo) supervises the scripts of the series, Kumi Horii (LBX Girls, Infinite Stratos 2) designs the characters, Come on Sakabe (Date A live franchise, Digimon adventure tri. film series) composes the music, and Yasunori Ebina is the sound director.
Scott MacDonald is the artistic director, while Tsukasa Ohira is credited for the artistic framework. Miyu Yamamoto is the key artist of color. Tsubasa Yokoyama is the director of compositing of photography, while Yoshiaki Kimura is editing. Yuichi goto is the 3D director.
Asaka performs the opening theme song from the anime “Ready Set Go !!” Erabareshi performs the ending theme song of the anime “Ambitious”.
The anime will air on Tokyo MX, MBS, and BS TVN on January 11 and will be presented in preview on AT-X January 15th. Funimation Exclusively airs the series and has already aired a first preview of the first episode on Friday.
Ryusen started serialization the story on the “Shōsetsuka ni Narō” (Let’s Become Novelists) website in April 2012, where it is still ongoing. Micro magazine publishes the story in print with illustrations by Fuzichoco (The 8th son? I hope you are joking?, Stem rehabilitation art), starting with the first volume printed in June 2014.
Dicca Suemitsu launched a manga adaptation of the novels on Micro magazine‘s Comic ride manga site in July 2016.
Seven seas published the first printed novel volume on August 12 and the first printed manga volume on July 20.
Source: She declared herself a pupil of the sage the animated ones website, BD Nathalie