There are several easter eggs for vol 4, but I wonder if the constellation on Sugi's neck is Cassiopeia, and the moles on his middle finger are a representation of Orion... also the hydra, serpent, venom theme was very present on Megi's hand tattoos...and if Utsugi is "your highness " and Aogiri is the "captain" there must be an ancient kind of vampires around, Sugi, Utsugi, Aogiri being the oldest ones so fast in the story.
There are several easter eggs for vol 4, but I wonder if the constellation on Sugi's neck is Cassiopeia, and the moles on his middle finger are a representation of Orion... also the hydra, serpent, venom theme was very present on Megi's hand tattoos...and if Utsugi is "your highness " and Aogiri is the "captain" there must be an ancient kind of vampires around, Sugi, Utsugi, Aogiri being the oldest ones so fast in the story.