The Testament of Sister New Devil

Tetsuto Uesu and illustrator Nekosuke Ōkuma launched The Testament of Sister New Devil in January 2012 through Kadokawa Shoten's Sneaker Bunko imprint. The series spans thirteen volumes, blending high school life with dark fantasy elements as the protagonist Hiroto Sakai discovers his hidden demonic heritage. Readers follow his struggle to master new powers while navigating complex family dynamics and supernatural threats that threaten both worlds. The books explore themes of loyalty and identity within a genre known for mixing action with romantic comedy.[edit]