The official website for the upcoming anime adaptation of Cyberstep's massively multiplayer online role-playing game Onigiri announced on Wednesday that the idol group Starmarie will perform the show's opening theme song "Hime wa Rankiryū☆Goikkō-sama."

Starmarie formed eight years ago, and the group performed the fourth ending theme song for the Cardfight!! Vanguard G television anime series.

Takashi Yamamoto (Final Approach, Nanatsuiro Drops) will direct the series at Pierrot Plus (Beelzebub, Sabagebu!). Takamitsu Kouno (Utawarerumono: The False Faces, Abnormal Physiology Seminar) is handling series composition with Takashi Aoshima (Himouto! Umaruchan, If Her Flag Breaks) and Atsushi Oka (Ojisan to Marshmallow) collaborating on the scripts. Yukiko Ibe (Nanatsuiro Drops, Jewelpet Twinkle) is serving as character designer and chief animation director. Satoshi Shibata (Rainbow Days) is serving as art director and background artist. Junko Tsukidate (Lady Jewelpet) is handling color design and Kazutoshi Azuma (Isuca) is handling prop design. Zack Promotion is in charge of sound production.

The series will premiere on Tokyo MX and BS Fuji on April 7 at 1:00 a.m.

CyberStep describes the story:

Onigiri thrusts its players into mystical Japan, a land filled with mythical creatures of Japanese legend. Starting as a lone Oni, players fight against the malevolent influence of the Kamikui as their miasma spreads over the land. 8 NPCS, each with their own distinct personality and skills, ally themselves with the player to help build a legend, and quell the evil that has arisen. As you grow stronger together, so do the bonds binding you to each other.

The game first formally launched on PC in Japan in December 2013 (after alpha and beta test periods earlier in the year), and then launched in North America in July 2014. PlayStation 4 and Xbox One versions followed last year.

Source: Anime! Anime!; Arata Hanzōmon