This is my first story and English is not my first language. So dear readers, I apologize for any kind of mistakes.

Disclaimer: I don't own Diabolik Lovers or its characters. I just changed the story with my own heroine and added some side characters. The story is based on both the anime and the game.

Story involves: Action, Romance, Adventure, Comedy, Thriller, Murder, Offensive language, Slice of Life.

Before I start, I should introduce my OC. She will be the main character of my every story of Diabolik Lovers. The introduction is a bit long because it contains the full profile of the heroine like wikia format. Also the description of side characters are given for convenience.

Protagonist OC:

Name: Shizuma Tsubaki

Age: 16

Gender: Female

Hair Color: Silver

Eye Color: Golden

Race: Mix Blood (Human-Vampire Hybrid)

Sign: Capricorn

Birthday: January 7

Blood type: AB

Height: 5'5"

Weight: 48kg (105 lbs)

Hobbies: Practicing with weapons and playing cards and video games

Nicknames:

Kyonyuu/Melon (by Ayato)

Tafu-chan/Tough girl (by Laito)

S-neko-chan/Sadistic kitten (by Kou)

Gluttony Chick (by Yuma)

Ponytail (by her best friend)

Princess (by her butler and family friend)

Favorite Food:

Large sushi made by her butler. She's a foodie and likes to eat anything except vegetables.

Abilities:

Incredible Strength, High Speed, Heavy lifting, Swordsmanship, Gun fighting, Changing form into human and vampire.

Family:

Unknown for now.

Appearance:

Shizuma is a stunningly beautiful young girl with creamy white skin and a slender yet voluptuous figure (B90E-W56-H88 cm). She has sharp golden eyes with long and dark lashes. When she changes her form into vampire, her eyes get red and fangs show up. She has thick knee-length straight shiny silver hair with side bangs parted to left and both side layers that reach her chin. Usually she keeps her hair tied in a high ponytail with a black red stripe ribbon bow which she got from her mother as a present. In her childhood, she used the ribbon bow as headband with her hair down. She has two piercings on her each ear that consists black studs on earlobe and silver studs on mid ear.

Her school uniform consists of black Ryotei school blazer over her middle school suit which is a white striped shirt with a black sailor collar attached with a black button-down corset on top. On bottom she wears black school skirt with white petticoat and a mini shorts underneath. She wears black thigh high socks with black combat boots.

Her casual outfit is a red jacket over a black sleeveless buttoned-up high-neck top and tight brown denim shorts. She wears the same socks and boots with it. She also wears black finger-less gloves.

Personality:

In contrast to her appearance, Shizuma is a total tomboy with a dominant and stubborn personality. She is kind and friendly with humans but very rude and mean towards Yui and all the vampire brothers. She has three human friends whom she is really close with. She maintains two different personalities in her each form. As human, she is usually friendly, cocky and a bit cruel. But as vampire, she becomes extremely sadist even more than the DL brothers. She also gives all of them mean names exactly like they do to Yui themselves.

History:

Shizuma is the third child of her father. Her human mother was the second wife of her vampire father. Shizuma lost her childhood memory due to some turns of events but she remembered few memories of her parents. Her butler Akatsuki found her wounded from an orphanage, taught her fighting skills and raised her up as vampire and demon hunter. She started her school at a vocational institute for combat skills and increased her strength and abilities by training. She studied there till middle schooling. Two months later Yui had been at Sakamaki Mansion, her father Seiji hires Shizuma to kill the vampires for rescuing Yui.

Trivia:

1. Shizuma owns a brown Akita dog named Puchi.

2. She refers the Sakamaki and Mukami brothers as 'insects', 'bugs', 'trashes' or 'leeches'. She calls Yui as 'Gofer'. For some unknown reason, she never calls anyone by their first name and doesn't like to be called either. (Except her family friend and butler).

3. Other than Japanese, she can speak English and Korean.

4. She's an extreme gluttonous, yet she keeps in shape because of training and being vampire. Her gluttony for food influences her blood thirst too.

5. She's an excellent fighter. She's good in both physical fight and weapons.

6. Her foot size is 22.5 cm.

7. She's ambidextrous. That means she's capable of using both hands equally well.

8. She has no supernatural powers like the other vampires. She can't fly nor teleport. She can't turn any human to vampire.

9. Physically she's stronger than the half-bloods (Mukamis) and weaker than the first-bloods (Tsukinamis) and pure-bloods (Sakamakis). Later, because of excessive training and sucking Yui's blood, she becomes stronger than the Sakamakis.

10. She can get sick by human diseases.

11. She's immune to magic. Kou's red eye can't see through her heart. (Will be mentioned in the story when her true identity will be revealed)

12. Instead of 'watashi', she says 'boku' as first person pronoun. As for second person pronoun, she says 'omae' except for her butler, teachers and other elderly persons.

Supporting OCs:

Akatsuki:

He is a half-blood vampire and Shizuma's father's personal butler. He has black hair and red eyes. He used serve his master's first family before. He knew about Shizuma and her mother and was very loyal to Shizuma's father. He is kind towards human and trained himself as ninja in order to protect the mankind from demons and vampires. He promised his master to protect his daughter from all demons. He found Shizuma from an orphanage and then raised her up like his own child. He trained Shizuma to become an assassin and usually brings missions for her.

Socrates:

He's not my character because he's mentioned in the game Dark Fate and Lost Eden. But in my story, he's Shizuma's father's human friend and former colleague. He's an old man having snow white long beard and wears a black magician hat, which makes Shizuma address him Snowman. He works with Tougo Sakamaki (Karl Heinz) in the states. He gets medical blood-bags from hospitals and provides them to Shizuma and her butler Akatsuki.

Haruna Minamoto:

She is Shizuma's best friend. She has pink mid-length twin tails and turquoise green eyes. Shizuma and she went to same middle school before they join Ryotei Gakuen Academy. They were rivals at first.

Momoka Sachan:

She is a friend whom Shizuma adores. She met her at Ryotei Academy through Haruna. She is very short girl with childish appearance. She has shoulder-length cherry red hair and brown eyes. She wears a pink butterfly bow on her hair.

Xen Kekashi:

He is a blonde guy with aquamarine eyes. He has longish hair which is tied and has bangs in front. He wears a navy-blue forehead band. He is Haruna and Momoka's friend. He has a secret crush on Shizuma.