Shizuka Ōishi is the screen writer of Shingeki no Bahamut Virgin Soul.
Ōishi was hired by Mappa Studios to write the script for a season two of Shingeki no Bahamut. Before that, Ōishi was always working on her original stories, so first she was hesitating to join a project from second season. When she watched season one, she didn't like it, but she trusted producers and accepted the offer to write second season.
Because of her background in drama, Ōishi was able to give more depth to certain characters, for example Azazel.
Uniquely, Ōishi wrote the screenplay for every episode of Virgin Soul.