Almost as if a coordinated effort, two new menaces set upon Sakurashin at the exact same time! Murasaki Iyo, a super conservative senate member and the most dangerous threat to all demons, and Iruka Kujoin, a half-demon hunter who goes by the alias of Oni Slayer. Touka falls into Murasaki's inquisitive hands, while Kyosuke is pushed to the ropes by his natural predator, Iruka. Amid an already desperate situation, Murasaki further sets out to erase the very existence of the oni! Will the siblings be banished to darkness, just as Murasaki plans?!