Aishiteru, Nii-chans

Yuna Sakamaki, otherwise known as Yuna Komori, is the adoptive sister of Yui Komori, biological sister of Shuu and Reiji Sakamaki, and half sister to Laito, Kanato, Ayato, and Subaru Sakamaki.

She was assigned the task of protecting the prospective bride of her brothers at a young age. To be able to do that, she must go undercover. Yuna moved away to the church the day Yui was chosen, promising that she would protect the child from any harm that comes her way, even if it means death.

Disclaimer: I don't own Diabolik Lovers. I only own Yuna and this storyline/plot. All rights belong to the creator.