High School DxD: Asia & Koneko's Secret Contract!? features story by Ichiei Ishibumi and art by Hiroichi.

The naturally clumsy Sister Asia and taciturn cutie Koneko form an unlikely devilish duo. The two head out to answer summons from humans with requests, but... th-th-they want Koneko and Sister Asia to do what?! These two little devil beauties get to work! But can they really fulfill every desire?!