User blog comment:B214/Volume 17 spoilers./@comment-4547267-20140227025154/@comment-16281343-20140228105844

Hmm. Potential scene.

~When Rose went back to Northern Europe in Volume 11 to train in using defensive magic, Gondul asked her why she decided to become a Devil. Rose said she chose to become a Devil because she found a Devil boyfriend ;D

~Gondul said they are already in a relationship for 3months, and it's been more or less 3months before she went back home in 11.