Bestial Vampires

When Vampires go bestial, it's when they can no longer control themselves from ingesting blood. It's when they haven't ingested blood for a long period of time. Once a Vampire goes bestial, there is no possible way for them to return to their original selves and they enter a decrepit, beast-like state, almost like wild animals and very similar to Vampiric Beasts on terms of behavior and appearance. They lose all sense of reasoning and go crazy for the thirst of blood. We've seen an example of Vampire gone bestial in Chapter 8 where the daughter of a mother Vampire that Shin and Ko were delivering blood to goes missing along with that girls human best friend from school. The two girls end up trapped within the same building that Ko and Izuki's little sister were brought to in Chapter 6. They have no clue how to escape and once Shin and Ko appear to save the day, the Vampire girl had already gone bestial and drank too much blood from her human best friend who ends up dying in the process. The Vampire girl appeared to have wide bloodshot eyes and a striped horn appearing from the top of her head. It is not yet known if this applies to all bestial Vampires, but for now, we'll just have to assume so.