Tree Diagram

The Tree Diagram was a super-computer which, according to the best renowned scientists in Academy City, was the best in the world. This computer was loaded into the satellite, Orihime 1, to monitor many aspects of the city such as weather patterns and security.

Another use of this computer is to aid researchers with their experiments. This consent, on the other hand, is very difficult to acquire since the Academy City's Board of Directors are the only ones who are able to permit access to Tree Diagram. One permitted use of Tree Diagram was for the 'Level 6 Shift' Project.

During Touma's fight with Index (while being possessed by Johann's Pen), Index accidentally directs a Dragon Breath's attack to space and destroys the Orihime 1 satellite, destroying Tree Diagram permanently. Meanwhile, Academy City covers up this incident by announcing that Tree Diagram can't be contacted for an indefinite period.

It was revealed in volume 8 that the core of Tree Diagram still remains, and that the satelite might be repearable if it is retreived. Awaki is sent to retreive it while Mikoto, after hearing that the satelite might be repared, tried to stop her on her own. During this incident Kuroko also met Awaki and fought her twice doing her job as a Judgment. Awaki successfully escapes, but is cornered and beaten by Accelerator who unexpectedly snuck out of the hospital at Last Order's request. The core is subsquently destroyed by Accelerator, and Tree Diagram is now beyond repair.