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Worldview :XXX years ago, "Non-humans" were born into the world. What are Non-humans? :They are incredibly beautiful in appearance, with demon-like wings and tails. However, the definitive difference is their "food." Non-humans use human emotions as their source of life. They are similar to succubi/incubi. About their food, "Emotions." :Any emotion can be given. The larger the emotion, the more satisfied their hunger. You can love them a lot. You can be very angry. However, what happens as a result depends on them. They can technically satisfy themselves with human food, too. The taste of emotions seems to differ depending on the human. Non-humans have their own likes and dislikes. Emotions are provided through hugs, physical contact, words, and the surrounding atmosphere. By the way :Human x Non-human couples exist. They aren't rare. They can also have children. ___ :Several years later. Year XXXX. :The "Non-humans" who devour human emotions began attacking humans to survive. → Instances of humans losing their emotions due to having them forcibly sucked out occurred frequently. It became a minor social issue. :Therefore, humans announced the "Pairing System." What is the Pairing System? :A system where adults (Humans: 20 years old, Non-humans: 150 years old) form pairs. The country assigns them automatically. There are rules. ________________________________________ Rules :Living in the same residence. Non-humans must not forcibly devour emotions. Humans must provide a moderate amount of emotions. ________________________________________ :Year XXXX, Month X, Day X, Day of the week X As the number of Non-humans increased, incidents began to decrease. Leading up to the present. "...Eh, you? ...Hmm, change, change."