No sex or nudity is shown throughout the series, however the things the brothers do to the main heroine can be very uncomfortable

Yui is constantly being bitten by the brothers, she is bitten in various places, she is bitten 5 times by one brother in an episode.

Due to the brothers pasts, they are all sadists and some are masochists, they enjoy inflicting pain upon Yui and like seeing her scared expressions.

throughout the series, Yui has violent heart beats which make her in pain.

Some of the brothers choke Yui enough for her to nearly loose conscious.

throughout the series, a torn bloody dress is shown

The series does contain some quite moderate language such as "sh!t", "sl-t", "b!tch", and some uses of "f!ck" or other milder language such as damn, hell crap

Because this anime is based around vampires, the setting is dark and creepy. There are many scenes where things get disturbing.

Includes violence and disturbing scenes.