Yui Komori is the main protagonist of Diabolik Lovers.
Diabolik Lovers ~Haunted Dark Bridal~
There are a few scenes that involve her in the bathroom attempting to take a Bath in the Slipper Bathtub.
Diabolik Lovers (anime)
Diabolik Lovers More,Blood
She takes a Bath in a Drop-In Bathtub and is Peeped on.