・Dom/Sub Universe A second gender classification separate from biological sex. People are categorized as Dom, Sub, Switch, or Usual. ・Dom (Dominant) Possesses desires to "dominate," "protect," or "praise" a Sub. They have an ability called Command. ・Sub (Submissive) Possesses desires to "be dominated," "be protected," or "be praised" by a Dom. ・Switch A very rare gender that can function as either a Dom or a Sub. ・Usual The most common gender, accounting for the majority of the population.

・Dom/Sub Universe A second gender classification separate from biological sex. People are categorized as Dom, Sub, Switch, or Usual. ・Dom (Dominant) Possesses desires to "dominate," "protect," or "praise" a Sub. They have an ability called Command. ・Sub (Submissive) Possesses desires to "be dominated," "be protected," or "be praised" by a Dom. ・Switch A very rare gender that can function as either a Dom or a Sub. ・Usual The most common gender, accounting for the majority of the population. ・Play A special form of communication between a Dom and a Sub. Ideally and generally performed after establishing a relationship of trust. Caution is required to ensure that forced Play does not occur through the coercive power of a Dom's Command. ・Command Words (instructions, orders) used during Play. A Sub given a Command instinctively obeys (their body moves on its own) and gains a sense of satisfaction from having their instincts fulfilled. ⇒ Kneel (Sit down), Come (Come here), Stay (Wait), Look (Don't look away), Say (Tell me), Roll (Get on your back), Crawl (Get on all fours), Shush (Be quiet)... ・Safe Word A word decided in advance to protect the Sub during Play. If this word is spoken, the Dom must stop the activity immediately, no matter what. ・Subspace A state of intoxication (feeling light-headed) where the Sub's consciousness falls under the Dom's control during Play. This can only be entered when a relationship of trust is established. If the Dom does not properly control the Sub's consciousness, it can lead to a Sub Drop. ・Aftercare The act of a Dom praising the Sub after Play ends (gentle words, head pats, hugging). This gives the Sub a strong sense of happiness. If Aftercare is not performed, there is a risk of falling into a Sub Drop, so conscientious Doms consider this mandatory. ・Sub Drop A phenomenon that occurs when a relationship of trust is not established between Dom and Sub, when the Dom fails to provide Aftercare after Play, or when a Sub is subjected to a powerful Glare. Tension and anxiety escalate, causing the Sub to feel exhaustion and emptiness. In severe cases, they may lose consciousness or even face death. ・Glare An aura-like gaze emitted during a contest of strength with another Dom. A Sub hit by a Glare will tremble and be consumed by fear. However, if emitted during Play or Aftercare, it can be perceived as pleasure or happiness. ・Collar A collar given by a Dom to a Sub as proof of an established relationship. When a Sub wears this, they become mentally stable. It doesn't have to be a physical collar; anything recognized by both parties as a "Collar" can provide the mental effect (rings, bracelets, photos, etc.). If the Collar is removed, the Sub becomes mentally unstable.