of his parents in a car accident, Tatsuya tries to live to fulfill his father's last wish of becoming a "high caliber" man. After "saving" Seine from bullying, he insisted on trying to help her even after finding out the real goal of Seine. He is kind, optimistic and believes in other people's good side which is sometimes an obstacle in Seine's revenge. He is a bad cook, but Seine somehow is not bothered by his food. He has a crush on Seine and wants to be acknowledged as a "high caliber" man by her. Nagisa Yoshiyuki Nagisa is a girl in Tatsuya's class, a long time acquaintance, and would probably like to get closer to Tatsuya, but Nagisa has had violent allergic reactions whenever she is in Tatsuya's house ever since Tatsuya found a lost puppy (soon to be Crokette). She stays away from the house and the dog, effectively putting some distance between him and her, even though she loves him. She is the fourth person shown in the story to be infected by a "mushi". Minato-kun Minato-kun is a boy in Tatsuya's school, friend to both Tatsuya and Nagisa. Nagisa asks him to keep her allergy to dogs confidential. Shizuki (Pistis Sophia) Shizuki is the older sister of the "Akuma Twins". Being the older, she is sarcastic, lazy, and smart, but she has a weak body; she can get sick and tired easily, cannot swim in pools as a result of the chlorine, and almost was killed by Tatsuya's food. She has an immortal body and has lived for centuries. She gave immortal bodies to Seine and Shimon. Her former name was "Pistis Sophia" but she changed because it was "stupid". She is a Oyaji-con (she is attracted to "handsome" grown up men). The name Pistis Sophia is a character from an earlier work of Yuna Kagesaki's: Chibi Vampire, who is actually their younger sister Psyche. Shizuki and her sister call Seine "Sehne". Yuzuki Yuzuki is Shizuki's younger sister. She is the opposite side of her sister: her body has superhuman strength, she is diligent and a good cooker but is a little dumb. She is good-hearted and satisfies her Onee-sama's orders. She also has an immortal body and has lived for centuries. She is a Lolicon (she get excited by children, especially girls) to the point to kissing every children on their mouth upon seeing them.