Naiseikai Universe| The World of Introspection

内省の世界 - Naisei no Sekai | Official Light Novel Universe & Website

This Saga is where Pain mends and Molds the Heart <3


© All Rights Reserved | KarasuEJ / Alarkius Elvya Jay | https://www.alarkiusej.com/


For Fanbase or sub-fandoms, please refer back to our official subreddits or this website!

This universe’s original source of inspiration is from Mob Psycho 100


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Naiseikai Universe


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内省界 | The Naiseikai Universe

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内省界 | The Naiseikai Universe

Worldbuilding Details

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Books within Naiseikai

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内省界 | The Naiseikai Universe

Lore Timeline & World

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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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内省界 | The Naiseikai Universe

Lore Timeline & World

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:


Species of The Naiseikai Universe

In the Naiseikai Universe, this is an Alternate Earth that differs from the Earth we know and love. But due to the significance of Yokai, Spirits, Humans and Angels, the size of Japan has increased because new landforms were made due to Earth Yokais inhabiting the continent.

Here are the list of all the Yokai Races in Neo-Japan


Yokai Races of Neo-Japan

From Year 5 - 1599, a great descent of Yokai Races, Spirits, Angels and more have started to live in Ancient Japan. They just wish to co-exist with humans and not cause harm. There are apparently a lot of Yokai. And this entry catalogue every single one of them.


Avian Yokai

─────⊰Yokai: Crow (Karasu)

The Crow Yokai lineage traces back to 1809 with the Reinishi Karasu Generational Family. The most notable ability is their connection to silence and stillness—"The Quiet Crow" legend speaks of a dark magician named Karasu Reinishi whose spirit lingered as a soundless crow after death. Modern descendants like Hanako Reina possess tremendous supernatural powers including telekinesis, cryokinesis, and the ability to transform into crow forms. Crow Yokai age differently than humans, their appearance freezing around age 18 while their lifespan continues normally.

─────⊰Yokai: Raven (Watarigasu)

Raven Yokai are a distinct avian lineage separate from the Karasu (Crow) family, though they are often confused due to their similar appearances. Ravens descended during Year 5 - 1599 and established themselves in the mountainous northern regions of Neo-Japan. Unlike Crow Yokai who are connected to silence and stillness, Raven Yokai possess abilities tied to wisdom, prophecy, and memory manipulation.

Physical Characteristics: