The official website for the television anime of Yukiya Murasaki's How NOT to Summon a Demon Lord light novel series revealed three more cast members and the July 5 premiere on Friday. The new cast members are:

Atsumi Tanezaki as Klem



Sayaka Senbongi as Celestine Baudelaire



Yūka Morishima as Mei





The previously announced cast includes:

Azumi Waki as Rem Galleu



Yū Serizawa as Shera L. Greenwood



Masaaki Mizunaka as Diablo



Yumi Hara as Alicia Crystella



Rumi Okubo as Sylvie



Emiri Katō as Edelgard



The five main voice actresses (Waki, Serizawa, Hara, Okubo, and Katō) will perform the opening theme song "DeCIDE" under the unit name "SUMMONARS 2+."

The anime will premiere on July 5 on AT-X at 9:30 p.m, on Tokyo MX at 10:00 p.m., on BS Fuji at 24:00 (effectively July 6 at 12:00 a.m.), and on Sun TV at 26:00 (effectively July 6 at 2:00 a.m.).

Yūta Murano (Brave Beats, Dream Festival!) is directing the anime at Ajiado. Kazuyuki Fudeyasu is in charge of the series scripts. Shizue Kaneko is designing the characters. Yuki Nishioka is serving as chief animation director. Yuki Miyamoto is serving as monster designer and action animation director. Natsuko Otsuka is the color key artist, and Kusanagi is handling the backgrounds. Teppei Satō is directing the photography at Asahi Production Shiraishi Studio. Satoshi Motoyama is directing the sound at Half H·P Studio. Yū Serizawa will perform the anime's ending theme song. Creator unit HoneyWorks is producing the song.

J-Novel Club is releasing the novel series in English, and it describes the story:

In the MMORPG Cross Reverie, Takuma Sakamoto is so powerful that he is lauded as the “Demon Lord” by other players. One day, he is summoned to another world – but with the same appearance he had in the game! There, he meets two girls who both proclaim themselves to be his Summoner. They had performed an Enslavement Ritual to turn him into their Summon... but that's when Takuma's passive ability "Magic Reflection" activated! Instead, it was the girls who had become enslaved! Though Takuma may have been the strongest Sorcerer there was, he had no idea how to talk with other people. That's when he makes his choice: to act based on his persona from the game! “Amazing? But of course... I am Diablo, the being known and feared as the Demon Lord!” So begins a tale of adventure with an earth-shakingly powerful Demon Lord (or at least someone who acts like one) taking on another world!

Kodansha published the first novel with illustrations by Takahiro Tsurusaki in December 2014, and published the ninth volume on February 2. J-Novel Club released the third novel as an e-book on May 7. Naoto Fukuda launched the manga adaptation on Kodansha's Suiyōbi no Sirius (Wednesday Sirius) section on the Niconico service in June 2015, and Seven Seas Entertainment announced last September that it has licensed the manga.

Sources: How NOT to Summon A Demon Lord Anime's Website, The Mainichi Shimbun's Mantan Web, Comic Natalie