The Little Devil, Teeri, and the Messiah!?

[Passiflora C]

Or otherwise 小悪魔ティーリと救世主!? ;
Koakuma Thiiri To Kyuuseishu!?

A novel by the familiar duo Shougo Kinugasa and Tomoseshunsaku , the very first these two together tackled, and what ostensibly would later be used as the foundation-reference for his -Kinugasa's- succeeding , and rather well established, well known opus, COTE.

Of length 6 volumes, and of reputable background, it sounds like it has everything it needs for a sure license.