Despite this anime being "yaoi", there is almost no gay-love in the first 2 episodes. In episode 1, a male kisses another male angel in the chest, resulting a bad wound in the chest to heal quickly.

In episode 3, two men are gonna make love in the bed, but one of them just isn't in the mood for this.

Episode 4 has two male characters falling in love with each other.

There are many scenes of violence throughout this OVA series. Most of these scenes involve characters fighting, getting shot and beaten up. Blood can be seen in many of these scenes, but nothing too graphic.

Very few scenes have any male character getting electrocuted.

A character named Messiah has been created to eleminate the entire humankind on the Earth. There are lots of talkings about that in episode 4.

Some mild profanity, nothing too strong.

Episode 4 has drugs being present, but never used. A heavily drunk man can briefly be seen at a dark street.

Some of the scenes throughout the OVA series can be emotionally intense.

Some of the scenes of violence can be intense as well, but nothing too graphic unless you count with the climatic scene in episode 1.