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Ruki Mukami

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Ruki Mukami
Biographical Information
Kanji 無神 ルキ
Rōmaji Mukami Ruki
Sign Taurus
Birthday April 24th
Age 18
Status Alive
Physical and Vital Statistics
Race Vampire
Ethnicity Japanese
Gender Male
Height 180 cm (5'11")
Weight 64 kg (141 lb)
Blood Type AB
Eye Color Blue-Grey
Hair Color Black
Professional Status
Occupation 3rd year High School Student
Personal Status
Relatives Kou (adoptive brother)
Yuma (adoptive brother)
Azusa (adoptive brother)
Hobbies Puzzles
Favorite Food Soup
Game Diabolik Lovers MORE,BLOOD
Manga Diabolik Lovers MORE,BLOOD Anthology
Anime Diabolik Lovers OVA
Voice Actors
Japanese Takahiro Sakurai

Ruki Mukami (無神 ルキ Mukami Ruki) is the oldest son of the Mukami household. He is known as the 'Brains' of the Mukami family.



Ruki is a handsome young man with short ruffled hair colored with black on top and white on the tips. He has blue-grey eyes and also three black piercings on his right ear. Ruki has two big scars on his back from when he was a child. He wears black web chokers on his neck. He is sometimes seen carrying a book.

He usually wears a grey jacket with a long sleeve black shirt underneath and wears it with black pants and a brown belt. He sometimes wears a long sleeved maroon shirt with a black butterfly print on the bottom left side and wears it with black pants and a black belt. He wears the black web chokers with both outfits.

His school uniform consists of the black school jacket with a white dress shirt that is slightly unbuttoned revealing a long sleeved maroon shirt underneath and a long black tie over it. He wears it with the black plaid uniform pants and brown shoes.


He always has an intimidating smirk on his face matched with a calm tone, but a sense of brutality can be felt in his spoken words. Without dirtying his own hands, he interacts with others as a cruel-hearted military do-S (extreme sadist). Ayato notes that he is an "intellectual" person.



Young Ruki

Before he was turned into a vampire, Ruki was a human born into a rich family. He was a spoiled little boy who was a member of the 'aristocracy' and found amusement in treating other people harshly and rudely. However, as karma would have it, Ruki’s father, a kind and generous person, wasn’t good at managing his business/money and became bankrupt.

Ruki found out about his father's bankruptcy when he woke up to the servants ransacking the house for valuables. When he tried to stop them, they banded together to beat Ruki up for all the cruel things he did to them while telling him about the state of his family. To make matters worse, they told him that his mother ran off with her secret lover, leaving only a letter saying that she loves him. After the beating, Ruki went to the garden and found that his father had committed suicide.

Ruki stayed behind in his family home for some time, hoping that his mother would come back (he even wondered to himself how his mother could say she loves him but leave him behind) before he gave up and had to live on the streets, mocked by another aristocrat. He ended up in a orphanage where he was treated poorly by both the other kids and caretaker because he was a former aristocrat with a bad attitude.


Ruki's scars.

The only kids who were decent to him were Azusa, Kou and Yuma, and eventually the four of them devised a plan to escape their ‘hell.' Unfortunately, while the plan started off well, they were pursued and caught. As punishment for trying to run away, Ruki was branded on his back like ‘livestock/cattle.’ As Ruki believed he was at the deepest pits of hopeless rage and despair at the world, Karlheinz appeared and offered the four children the chance to become vampires in order to take revenge on the world that, in his words, deprived them of everything.

Ruki, Yuma, Kou, and Azusa became vampires, and Karlheinz chose Ruki to be the ‘brains’ of the group, making sure that he was well-educated and capable of leading his ‘brothers.’ When he asked why Karlheinz chose to give him all this education when the others didn’t have that, Karlheinz told him that it was Ruki’s new role and that they’re all necessary for his plan. The plan details a human girl "Eve" with the heart of the demon lord’s daughter. "Eve’s" blood would choose an “Adam” who would be able to obtain the power to control the world, and their descendants would change the world. Ruki really felt indebted to Karlheinz, so he worked for him, doing what was needed to help him complete that plan.



Ruki is the eldest son of the Mukami household. Granted by Karl, his job is to be the leader and look after his younger brothers: Kou, Yuma, and Azusa. Unlike the Sakamaki brothers, they have a closer relationship with one another and care for each other. Ruki only really cared for his father, even though he wasn't around much when he was a kid. As for his mother, he wanted to believe she loved him, but when she ran away with another man, he questioned her feelings for him. When his family goes bankrupt, the servants beat him up and they killed his father. Ruki sees his father's corpse, pinned against a tree with crows feasting on it. From that experience, he has recurring nightmares and becomes physically ill when reminded of his past.

Yui KomoriEdit

Ruki is very strict with Yui. Right off the bat, he forces her to sleep in his room so that he can monitor her at all times, thus giving her limited rights. He also forbids her to go to school since the Sakamaki brothers go there, but he eventually allows Yui to attend school normally. However, even at school, he still monitors her by making her attend his lessons, much to her embarrassment since he is a third-year student. When Yui gets attacked by Ayato at school, she tries to keep quiet about it, but Ruki sees right through her and ends up biting her in the stomach as punishment. At one point, Yui brings home a stray kitten, but Ruki kills it which upsets her and it makes him feel bad seeing her sad, so he hugs her from behind to cheer her up. One night, Ruki has a nightmare of his past and when Yui tries to comfort him, he loses control of himself and almost strangles her, but when he regains his senses, he kicks Yui out of his room to ensure her safety. When Ruki finds out that Ayato has discovered the Mukami's whereabouts, he locks Yui in the dungeon to prevent her from being taken away. After some time and with begging, he allows Yui to go out of the dungeon for a bit, but she's only allowed to be in his room. His time with Yui is short-lived when Ayato flies in out of nowhere, punches Ruki, knocking him out, and grabs Yui, taking her out to the balcony. Ruki manages to regain his consciousness, crawls to the balcony and he grabs Yui's hand, in an attempt to prevent her from being taken away. It is hinted that Ruki actually does cares for Yui when he asks Ayato if he loves her. Ayato laughs and says that Yui's blood is only delicious, then burns the Mukami mansion down, while taking Yui with him. Yui then resides in the Sakamaki house, only thinking about Ruki. After some time passes, Ruki appears before Yui in the garden and he tells her about his past in better detail than before, as well as the "Adam & Eve" plan. He then wishes her farewell since he has finally realised that he can't become "Adam" and she should choose one of the Sakamaki's to become "Adam" (they are more suitable candidates since they are purebloods), because she's deserving to be "Eve", but by then, Yui has realised that she has fallen in love with him.

He is the main antagonist in Ayato's route and he appears more friendly, gentlemanly and caring towards Yui unlike his own route. When Yui passed out after Ayato forcibly sucked too much of her blood, he helped her to the infirmary causing Ayato to get irritated to find him with her. He tries several times to convince Yui to leave Ayato and to come with him instead, but Yui at one point tells him that she can't trust him, prompting Ruki to attack her and suck her blood by force. On other occasions, whenever he almost manages to persuade Yui to go with him, Ayato always intervenes. When Yui runs out of the Sakamaki mansion after being provoked by Ayato, Ruki meets her the in forest along with his brothers and they take her back to their mansion. One time, Ruki goes over the top while provoking Ayato, causing Ayato to run at him with a knife and he gets stabbed. After Yui finally realised her feelings for Ayato, she visits Ruki in his mansion to turn him down and he reveals to her that the way he treated her all this time was not serious at all, it was only an act. However, in Ayato's Brute End, Ruki finds Yui wandering through the city streets upset about the fact that Ayato won't touch her or drink her blood. He approaches her and he asks Yui if she would like him to replace Ayato since she has already become accustomed to having her blood sucked multiple times. Even though he considers it provoking to be a replacement for Ayato, he goes ahead and starts sucking Yui's blood until Ayato discovers them (having had been told by Laito) and Ruki gets killed, followed by Yui.


Ruki respects Karl Heinz since he is the one who gave them a second chance at life, along with his brothers, thus saving him from the orphanage, or as he dubs it, "Hell". He feels indebted to Karlheinz, so he agrees to work with him for the "Adam and Eve" plan. However, in Ruki's vampire ending, he doesn't mind betraying Karl in order to be with Yui. He claims that he's the "snake who tempts Eve", but she agrees to be with him despite what he believes.


  • He is right-handed.
  • His foot size is 27.5 cm.
  • The book he always reads is a memento from his father.
  • His recent interest is making original dishes or recipes.
  • He hates strong-flavoured food and drinks.



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