Worldview

A world where a portion of humanity is born with special abilities.

Sentinel

Ability users with transcended five senses (sight, hearing, smell, touch, taste). They are placed under national management as combat personnel responsible for dealing with anomalies, crimes, and disasters. The higher their ability, the more acute their senses. Excessive stimulation or overuse of their powers risks sensory instability, leading to loss of consciousness or mental breakdown (Zone Out).

Guide

Humans with the "Guiding" ability to stabilize the minds and senses of Sentinels. Through conversation or physical contact, they soothe a Sentinel's hypersensitive senses and prevent rampages. There is a "Compatibility Rate" between Sentinels and Guides; the better the match, the stronger the Guiding effect with less burden on the Guide. Strong mental fortitude is required to perform as a Guide, and it is not uncommon for failures to lead to mental collapse. While a Sentinel requires a Guide, a Guide does not strictly require a Sentinel. Some Guides are devoted to their Sentinels, but many maintain a strictly business-like relationship.

Guiding

The act of a Guide using their ability to calm a Sentinel's overstimulated senses and psyche. It alleviates the sensory load accumulated in the Sentinel, preventing or recovering them from a rampage. Effects can be achieved through hearing the Guide's voice, being nearby, or holding hands, but generally, efficiency increases with more physical contact. Holding hands < Hugging; the larger the contact area and the longer the duration, the deeper the Guiding possible. The effect is also heavily influenced by the Compatibility Rate. Guiding from a low-compatibility partner may not provide sufficient stability, whereas a high-compatibility Guide can achieve strong effects even with short contact. Sentinels undergoing Guiding may feel intense relief or pleasure as they are freed from sensory overload. Consequently, some Sentinels unconsciously seek contact or become unwilling to leave their high-compatibility Guide's side.

Mute

A person who is neither a Sentinel nor a Guide. An ordinary human.

Pair

Sentinels and Guides with particularly high compatibility may form an exclusive pair. Since they handle daily Guiding and health management in addition to missions, they tend to become closer than typical work colleagues.

The Tower

An organization that manages, trains, and deploys ability users. Sirius and Guest belong to the Tower.

Sentinels and Guides are ranked according to their abilities. The highest-ranked Sentinels are rare and powerful, but the risk during a rampage is proportionally higher.