Nandan Observatory

**Nandan Observatory** (南暖なんだん天文台, *Nandan tenmondai*) is the observatory on Nandan Island, Japan.

## Overview

### Geography

The observatory is located on an island and is surrounded by sugarcane plants. Except for sugarcane harvest season, only the observatory's staff and guests are usually on the island.

### Structure

The observatory is a two-story building. On the first floor are the lobby, the dining hall, and the kitchen. In the lobby, a model gun is showcased to honor the island's old tradition of displaying a matchlock gun to protect the sugarcane from evil spirits. There is also a storage room and a restroom on this floor.

On the second floor, at the end of a hallway, is the entrance to the observation room.

The observation room is completely soundproof when its dome is closed. When the dome is opened, the telescope turns. It is computer-controlled and can automatically follow and record selected stars. There is also a motion detector which rings out an alarm if something enters through the dome's ceiling; its primary purpose is to keep out wild animals.

Furthermore, there are multiple bedrooms for staff members and guests.

The observatory's master key is kept in the office in the lobby.

The lobbyThe observation dome opens.The dome from outside.The telescope in the dome.The observatory at night.The meteor shower begins.
## History

### Nandan Observatory Murder Case

*Main article: Nandan Observatory Murder Case*
Ten years ago, seven people—among them, Takumi Jumonji's father who was the director at that time—were shot to death in the observation dome during a viewing party for the meteor shower in the constellation of Leo. The observatory was almost closed after this incident.

### Island Observatory Murder Case

*Main article: Island Observatory Murder Case*
A decade later, Jumonji organizes another viewing party for the meteor shower in the constellation of Leo to overcome the past tragedy and honor his late father's love for space. He invites Totomaru Isshiki, a detective from the Metropolitan Police Department, and John Grizzly, an instructor at BLUE, to make sure that history will not be repeated. Toto brings along Ron Kamonohashi; the astronomy chairman Eisaku Donzawa, the astronomical photographer Kayoko Onodera, and the Orion constellation idol Princess Ori are invited as well.

The viewing party starts at 11 p.m. and takes place on the roof where a standing buffet has been provided by the observatory's cook Minami Unno. At first, the party goes well and everyone present can peacefully spectate the meteor shower. A few hours later, the dome unexpectedly starts to open and move, and a gunshot is heard from inside. Onodera is later found dead in the observation room with an unconscious Ron lying across from her; a gun lies beside him.

## Known staff

* Takumi Jumonji (latest director)
* Minami Unno (cook)
* Takumi Jumonji's father (former director)

## Known guests

* Totomaru Isshiki
* John Grizzly
* Kayoko Onodera
* Princess Ori

## References

1. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, pages 8-9
2. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, page 6
3. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 11, page 6
4. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, page 10
5. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 10, page 16
6. ↑ 6.0 6.1 *Ron Kamonohashi: Deranged Detective* manga; Chapter 12, page 9
7. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, pages 10-11
8. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, page 12
9. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, pages 19-20
10. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 10, page 9
11. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, page 9
12. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 11, pages 19-22
13. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, page 31
14. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 10, page 13
15. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, pages 16-18
16. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, page 18
17. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, pages 16-17
18. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, pages 13-14
19. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, page 19
20. ↑ *Ron Kamonohashi: Deranged Detective* manga; Chapter 9, pages 20-35