Rui is an Vampire prince. One night, Rui had left his palace to go to the human town is disguise, trying to find things to make his inventions stronger. but as he arrived in the town, his thirst for blood started, as he waked through the town, smelling all the humans who were out at night, made him so eager for blood.

Rui had to take a break in a dark alleyway, trying to make sure he won't attack of the humans around him, he cannot have that now.