Vampire

The manga has not explained how vampires work. There are some odd things, such as Satsuki hungering to feed on the blood of women every full moon.

• Drinking blood from a human does not make that human a vampire.
• It has not been stated if humans can become vampires.
• Vampire fangs appear to be able to retract.
• Sunlight does not appear to be fatal to vampires. There may be an aversion to it.
• Drinking the blood of nonhumans can have unintended side effects.
• One example of this is a girl vampire drinking a male vampire's blood causes a highly aroused state in the girl for that male vampire. This effect appears to last for about 2 hours. Fulfilling the desire may cause it to end sooner, or just alleviate the desire.

How vampires react to garlic is not mentioned. For this story, garlic can cause reactions.

Biology

Society

Vampire families are the same as human families.