内省の世界 - Naisei no Sekai | Official Light Novel Universe & Website
This Saga is where Pain mends and Molds the Heart <3
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This universe’s original source of inspiration is from Mob Psycho 100
Naiseikai Universe
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Naiseikai Titles - Story Order
Haruhi Aoi / Aru - Naiseikai Mascot
Lore Timeline & Worldbuilding
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Worldbuilding Details
Books within Naiseikai
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Naiseikai Titles - Story Order
Books and Stories
The Quiet Crow and The Ninja! (Vol 1)
Upcoming Stories……
Nevertheless, You’re Still My Sister!
Can this Dullahan fall in Love? (Vol 1)
The Lonely Android and her 2GFs (Vol 1)
Alternate Realities
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Naiseikai Titles - Story Order
Alternate Reality Story
GyakuTen – Paradoxical Reincarnation
A saga of shadowed bloodlines and hidden truths, and self introspection...
This is a world where it will move your hearts.
📍 Setting: Neo Japan | Tokyo | Beyond | Set in the year 2100 +
All references here that relates to our book, worldbuilding, or quotes, are coded in:
妖怪と人間の連合法 Yōkai to Ningen no Rengōhō
Yokai cannot kill or murder humans because it is illegal, even if it's the other way around. It's about moral laws and ambiguity between parties. There are a lot of Yokai when they appeared, which upsets the balance of humans. So together, both outstanding leaders of these parties banded together to form this act.
However, it is NOT illegal for Yokai to kill Yokai. It has been a tradition since the early yokai settlements from Year 5 - 1599, since the first few yokais appeared in Year 5.
Ninjas (Shinobi) are not Yokai. They are high classed humans that specialize in Shadow abilities using tomes and runes.
The oldest yokai (of the Naiseikai World) to ever exist is the representor of all Yokai. Her name is Mizumi Kamekoryu, a Dragon Turtle. She ages very slowly due to the factors of dragon blood and turtle biology. She ages once every 50 years. As of the year 2100, she is now 2095 years of age, despite looking like she's in her 40s.
The Human Representative of the YHCA is led by Hibiki Aoba. She has somehow attained an anti-slow aging product which allowed her to prolong her life. She might be the same age as Mizumi. (AHAHA ARU IS SHIPPING THAT!!!)
The YHCA’s Headquarters is located in the Ninjin Prefecture alongside the NYAQ, since these two organizations rely on each other time to time.
When the act was formed in Year 1700, both human and yokai leaders agreed upon five fundamental doctrines to govern their coexistence. These doctrines are inscribed on five stone pillars located at the YHCA headquarters in Kyoto, Japan. Each pillar is written in both Japanese and the ancient Yokai script.
─────⊰ Doctrine I: Sanctity of Human Life
"No yokai shall take the life of a human, regardless of provocation, transgression, or threat. To do so is to break the foundation of this pact and invite judgment upon oneself."
This doctrine establishes the core protection for humanity. Any yokai who kills a human faces severe consequences, including potential execution or permanent imprisonment. However, self-defense clauses exist in extreme cases, though they require extensive tribunal review.
─────⊰Doctrine II: Equality Under Consequence
"No human shall take the life of a yokai without cause recognized by law. The act of murder knows no species, and justice shall be blind to form."