The Testament of Sister New Devil (2015)

S2E1 What I Can Do For You

Following his victory over Zolgia, Basara enjoys a tranquil life with his two younger sisters, Mio, the former demon lord's daughter, and her succubus sister, Maria. While he focuses on getting ready for the upcoming school sports festival, Basara suddenly finds himself under attack by someone enchanted by magic. This incident stirs memories of an unsettling look he noticed at school, leading him to suspect that something more sinister may be at play.