Udy Dietner

**Udy Dietner** (ユデイ・デイトナ, *Yudi Deitona*) is a student at BLUE. She is the third-best student of her class.

## Physical description

Udy has short, two-colored hair: It is black in the front, and green in the back. One streak of her black hair is braided. She usually wears her BLUE school uniform.

## Personality and traits

Unlike her friend Alissa, Udy is always cheerful and lively.

## Biography

### Ron Kamonohashi's Homecoming Case

Udy watches Ron Kamonohashi and Totomaru Isshiki arrive at BLUE from a window, along with Alissa Beaumont and Marsh Leipley. Not knowing who they are, they decide to deduce their identities. Udy thinks they are new instructors from Japan because Toto is carrying a bag with rice crackers from Asakusa. Billie Za Gozzila then arrives, and Udy scolds her for bringing her pets again to class.

Udy later attends Toto's first lecture, but sleeps through most of it. Afterward, Udy and Marsh stand before a classroom when Ron and Toto find them. They explain that they wanted to prepare some materials for their next class; however, the door is locked, though Alissa should already be inside. Wanting to help, Ron and Toto look through the window above the door and spot Alissa's lifeless body.

As the key is in the staff room and, thus, too far away, Toto and Ron decide to enter the room via the ledge outside. However, the room's window is locked as well, and someone also threw Alissa's head into the pond below. Ron then sends Udy and Marsh away to get the key. They return not long afterward, with the key and many other students who want to see Totomaru solve an apparent murder case.

Toto tells the gathered mass that Alissa was not murdered; it was only a prank: Alissa hid in the storage space under the floor and stuck out her head; the "body" they saw was not hers but a dummy's. She likely planned to make her corpse "disappear" and spook Toto while they went to get the key from the staff room. However, Ron and Toto chose to enter the room from the window ledge. Alissa then threw the dummy's head into the pond, thinking that she could leave the room while they went to inspect the head. Again, her plan was thwarted because Ron still checked out the room. Alissa had used a sheet of false blood for her farce, but when she left her hiding place, the hole in the sheet became visible. She hastily had to pull the sheet under a pillar; this gave her prank away, as Ron noticed that the bloodstain had moved without losing its shape.

Thereafter, Toto opens the door. Even though Alissa should be inside, she is not: She attempted to escape via the ledge but did not get far because she became frightened, and she is now stuck on the ledge. Toto manages to pull her back into the room right before she slips and falls. This action wins Totomaru over for Udy.

The next day, Udy goes to BLUE with Alissa and Marsh. On the way, they run into Ron, Toto, Billie, and Night Bran Jr.. Hutter Horn is already there and waves at them in panic when they arrive. He came to BLUE to talk to Aimee Emmerich about his academic advancement plan, but when he entered her office, he found her collapsed at her table. Immediately, everyone rushes to Aimee's office and discovers that Aimee was shot and a strange video is playing on her laptop.

### Cryptid Serial Murders Case

Ron orders the students to stay back while he examines Aimee's body; with a heavy heart, he confirms her death. Aimee died two or three hours ago, and the bullet passed through her body and is now lodged in her chair. The murder weapon lies on the ground, empty of bullets.

When Toto and Ron are done inspecting the crime scene, Night tells them that Aimee asked him to see her an hour ago. Alissa was also called by Aimee to help move Billie's pets, and Alissa asked Udy, Marsh, and Billie to assist her. Everyone, thus, deduces that whoever killed Aimee must have called them to BLUE, possibly so that they find her body. This means that Aimee's murder is a declaration of war to Udy, the other students, Ron and Toto.

Then, the academy's guard comes into the office, intending to ask Aimee whether the emergency isolation system is running. When it is activated, the system blocks internet and phone signals as well as pulls the drawbridge. Toto and Ron rush outside to check the bridge, but it was already drawn and because only Aimee knew the isolation system's deactivation code, they are now trapped in the school.

Later, everyone gathers in a lecture hall to discuss why they might have been isolated at BLUE and how to proceed. While Ron and Toto check Aimee's laptop, the students separate and wander alone through the school. Udy stays with Alissa and only leaves her side to go to the bathroom. Udy is subsequently caught and killed. Her body is discovered around 20-30 minutes later in the courtyard. Her corpse bears deep gashes and a piece of paper saying "Chapter 1: The messenger from the sky Wyvern" is next to her. Curiously, although Udy lies in the middle of the courtyard, only her footprints are visible.

Ron eventually deduces that Billie knocked Udy unconscious and transported her into the center of the courtyard with a wire that she had strung from the connecting hallways across the courtyard. Wearing Udy's shoes, Billie walked to Udy and murdered her "like a wyvern." She then returned the shoes to Udy and left via a secret path under her corpse.

## Skills and abilities

* **Deductive ability:** Udy possesses good deduction skills, ranking third behind Night and Alissa in her class.

## Relationships

### Alissa Beaumont

Udy and Alissa are best friends. They spend a lot of time together and often eat together on the roof. Udy never had a problem with Alissa. However, Alissa only realized how important Udy was to her after her death.

## Trivia

* The MangaPlus translation romanizes her first name as "Yudi." Akira Amano, however, spells it as "Udy."

## References

1. ↑ 1.0 1.1 File:July 2023.png
2. ↑ 2.0 2.1 2.2 *Ron Kamonohashi: Deranged Detective* manga; Chapter 98, page 4
3. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 106, page 14
4. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 97, pages 14-17
5. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 97, pages 27-29
6. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 98, pages 15-19
7. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 99, pages 1-14
8. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 100, pages 7-17
9. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 101, pages 2-7
10. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 100, page 9
11. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 101, pages 7-19
12. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 102, pages 1-3
13. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 101, pages 20-21
14. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 102, pages 4-9
15. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 102, page 14
16. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 103, page 11
17. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 103, page 10
18. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 102, pages 18-19
19. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 103, pages 7-10
20. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 111, pages 9-12
21. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 98, pages 3-4
22. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 105, page 4
23. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 106, pages 13-16