User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-81.111.230.161-20150807185054

I really hope they introduce somthing unexspected soon. Like maybe Matsuda and Motohama are the final longinus wielders. Or a transfer student comes to stay at the residence. Or some Dr. Doom like character comes and views the supernatural as obselete, and as the devils live for greed and fufiling their own desires (as Rias said) how can they be beneficial to humans. After the Trihexa is dealt with the mantle of main villan needs to be filled by someone that is not just plain evil and actually has an ideaology that is logical.