She is in the second year of high school and is passionate about donating blood. Because she has very exceptional type chimera blood, her blood is hardly useful for other people. She safeguards Mai, a beautiful vampire girl who she happens to meet, and struggles to get blood for the hungry girl. She sets up the Blood Donation Club at school and assumes the post of its captain.

A beautiful vampire girl lost in an unfamiliar land. Mai is descended from the Transylvania clan, a prestigious vampire family. She is shy and faint-hearted, and can’t bite and suck people's blood even though she is a vampire. She was hungry and had no one to turn to, but met Mitsugu, who decided to help her and take her home.

A beautiful lady who is the Seijumonji High School nurse and the Chimatsuri Blood Research Institute director. Although she is wild and has a potty mouth, she is kind at heart. She becomes interested in Mai (especially her blood) and supports Mitsugu. She creates a Blood Donation Club at school and becomes its advisor to gather food for Mai and collect rare blood to pursue her own interest.

She is tall and slender, and leads the Dance Club. She is strong-minded and full of curiosity, and will do whatever it takes to get what she wants. She loves Okinawa!

Interested in watching and making movies, she is a self-proclaimed natural-born documentary filmmaker who wants to film everything. She is also very knowledgeable about vampires.

Despite her cute appearance and way of speaking, she is very daring. She is extremely passionate about cosplay. She is also a cat lover with a cat named Tamasaburo.

She is a perfectionist who is quite stubborn and unwilling to compromise on anything. Her “Ittokan tin can” attack on discipline violators is notorious. She is an active gamer.