Sunghoo Park was also behind the cast of Yuta's voice actor with Ogata's job surprising them as a result of Yuta being a young male voiced by a woman.
And yes, the story switches tones really quick, it goes from a dark and gritty tone to a light hearted tone pretty fast.
The first half of the show is primarily dedicated to showing the ropes of the world to Yuuji, but even this basic setup is handled in some pretty fun ways.
Rika fatally wounds Geto as the war is won by the sorcerers.