Isolation Dimension

Isolation Dimension (孤独空間) is a phenomenon featured in  Asu Random I and  Asu Random II. It is assumed that this phenomenon is the creation of the Heartseeds known collectively as No.3.

Description
The Isolation Dimension, as its name implies, is an alternate dimension that isolates certain individuals from the normal world. Physically, the dimension looks no different from the norm, but the people in the dimension are completely cut off from those outside of it. In the Isolation Dimension, the Heartseeds can cause their phenomenons without worrying about any detrimental effects on the outside world. People outside of the area will not notice anything strange going on inside or people missing in the real world. Only people who were directly involved with the phenomenons would notice anything. Aside from the StuCS, only Hirata Ryouko, Gotou Ryuuzen, and Yaegashi Rina notice that people were missing and it's too quiet at school because their body were used by Heartseed and No 2 at one point. As described in Asu Random, it is similar to a laboratory for the Heartseeds to do experimentation.

The dimension is exactly the same as reality but under the complete control of the Heartseeds. Yamaboshi High School is there but the principles of the dimension prevent the people trapped inside from leaving the school grounds. All communication devices such as cell phones and computers won't work. Water and electricity still run as normal, however. From what No.2 claims, the people inside don't need to eat, drink, or sleep. In this dimension, people are split into groups of 5, who are usually grouped by people who have good relations with each other or club members, and are forced to undergo different phenomenons that No.3 has planned. If a serious argument or conflict arises that may cause serious harm to another person, Forced Termination will be activated and the people involved will disappear and lose their memories of the people still in the Isolation Dimension.