Mainframe

Mainframe
Sector(s)	1, 2, 3, 4, 5
Locations

For the more details about this location, go to File No. 172 of the Mystery Files.

The Mainframe is a location in 13 Sentinels: Aegis Rim.

Overview

The mainframe (sometimes referred to as the UFO) houses Universal Control. It has a diameter of 30 km, and is located 300 meters beneath Ashitaba City.

When the Deimos attack each sector, they focus on the locations on the terminals in order to burrow underground and find each sector's respective mainframe. When all five sectors have been taken over by the Deimos, the five sectors reset, and a new loop is created.

Events

17 events take place at this location:

#	Name	Protagonist	Setting	Description
009	The Final Countdown?	Iori Fuyusaka	Sector 1/2104: Mainframe	A memory of a dream Iori Fuyusaka had. Three teenagers discover an ominous countdown amid what seems to be the ruins of an alien spaceship.
010	Escape from the End	Juro Kurabe	Sector 1/2105: Mainframe	A memory of a dream Juro Kurabe had. As the Earth's crust crumbles beneath the buried UFO, the three teens plan an escape to the past. Okino, unable to set a timer on the transmitter, sacrifices himself to allow Juro Izumi and Chihiro Morimura to make it through to Sector 0 without him.
056	A Biometric ID	Renya Gouto	Sector 3/2025: Mainframe	Renya Gouto had pondered the possibility that Iori Fuyusaka and Chihiro Morimura's biometric ID were the same, and took the unconscious Fuyusaka to the mainframe. Using her biometric ID, he is successful in accessing Morimura's logs.
057	The Future Renya Gouto	Renya Gouto	Sector 3/2025: Mainframe	At the mainframe, Renya Gouto looks at Chihiro Morimura's two logs, as well as the log of Renya Gouto from 2188. The Shikishima CEO in the 2188 log calls himself Renya Gouto.
070	Sentinel No. 16, Respond	Tomi Kisaragi	Sector 3/2025: Mainframe	Tomi Kisaragi and company make it to the shifter 300 m underground. As Kisaragi touches a mysterious display, she is able to communicate with the missing Sentinel No. 16. But the transmission is quickly cut off, and they are attacked by androids once again. The shift is executed right as they are in danger, and they escape 2025.
080	A Tragic Love	Iori Fuyusaka	Sector 3/2025: Mainframe	Iori Fuyusaka manages to shift into the UFO that was in her dreams. As she investigates the alien-like dolls and the machinery, the boy she likes appears along with Ryoko Shinonome. Fuyusaka, who had been hiding behind the androids, feels saddened by seeing how he feels about Shinonome.
128	Accessing the Mothership	Renya Gouto	Sector 3/2025: Mainframe	Renya Gouto and Chihiro arrive at the mainframe. To stop the manufacturing of kaiju at the automated factories, Chihiro uses her senior admin ID to try and access the mothership.
230	Ida vs Amiguchi	Shu Amiguchi	Sector 3/2025: Mainframe	Shu Amiguchi confronts Tetsuya Ida, who's taken Yuki Takamiya hostage. Ida then commands Miyuki Inaba's functions to be shut down. Ryoko Shinonome manipulates the equipment to shift herself, Ida, and Takamiya to Sector 4, leaving Amiguchi and the black suits behind. As Amiguchi and the black suits try to find a way out of the mainframe, Natsuno Minami appears.
233	Terraforming	Tomi Kisaragi	Sector 3/2025: Mainframe	Tomi Kisaragi and Tsukasa Okino shift to the mainframe to find Shu Amiguchi and Natsuno Minami there as well. After seeing the log of Tomi Kisaragi from 2188, they reestablish communications with Miyuki Inaba and hear how she plans to change Universal Control.
247	The Mystery Deepens	Takatoshi Hijiyama	Sector 3/2025: Mainframe	Tsukasa Okino takes Takatoshi Hijiyama to the UFO, where Hijiyama learns that the 30 km-long UFO is buried 300 m beneath Ashitaba City. He also discovers the reason why the Deimos attacked 1945 before 1985, as well as all the current information on the innerlocitors and the D-Code.
272	Strange Atmosphere	Takatoshi Hijiyama	Sector 3/2025: Mainframe	Takatoshi Hijiyama and Tsukasa Okino shift back to the UFO. However, things in the UFO seem off, and they're suddenly attacked by several androids. The two of them try to shift back, but with the controls moved Hijiyama is able to shift while Okino is left behind in the UFO.
275	Okino's Death	Takatoshi Hijiyama	Sector 3/2025: Mainframe	Takatoshi Hijiyama takes down the androids that come at him one by one with the phaser. He runs over to where Tsukasa Okino is lying, and after entrusting Hijiyama with a letter, he vanishes.
301	A Shift of the Populace	Renya Gouto	Sector 4/1985: Mainframe	Chihiro begins mass shifting 1.2 million civilians from Sector 4 to Sector 3.
303	Mother and Son	Renya Gouto	Sector 4/1985: Mainframe	As Chihiro finishes shifting the civilians, Takatoshi Hijiyama brings a request from Tsukasa Okino.
304	Sentimental	Renya Gouto	Sector 4/1985: Mainframe	In the Sector 4 mainframe, Chihiro fulfills Tsukasa Okino's request to complete analysis of the Meta-Skills.
305	The Last Hope	Renya Gouto	Sector 4/1985: Mainframe	Renya Gouto pleads Chihiro to establish a connection with Miyuki Inaba in the command ship. By programming three satellites to move into broadcasting position, she successfully opens the line of communication.
309	Your Biggest Fan	N/A	Sector 4/1985: Mainframe	Tetsuya Ida restores connection to Sector 4 and speaks with Miyuki Inaba via transmission. As her ship nears the end of communication range, he requests that she sing for him once more.