The Testament of Sister New Devil

In this manga adaptation of the light novel series, high school student Basara Toujou’s life is upended when his father remarries and presents him with two new stepsisters, only for him to discover they are actually the heirs to two warring demon clans. Published by Delcourt from 2015 to 2018, this nine-issue series is best known for its blend of fantasy action and ecchi comedy, brought to life by the original story team of Tetsuto Uesu and the art of Miyakokasiwa. It matters as a compact, visually dynamic entry in the harem-action genre, capturing the manga’s popular mix of demonic intrigue and fan service.