Fujiwara no Moko and Kaguya Houraisan (Touhou)

It stems from the fact that approximately 1,300 years ago, Kaguya Houraisan humiliated Mokou's father and the entire clan by giving him an impossible task when he proposed her hand in marriage. Mokou grew up hating the moon princess and sought revenge. However, Kaguya disappeared, returning to the moon before her revenge could be accomplished.
The reason Mokou and Kaguya beat each other up is because they are immortal and bored without constant fighting. Death, even if temporary, serves as a contrast to their never-ending life and allows them to feel alive.
At the same time, according to one description, Mokou and Kaguya's relationship is now far from the hatred they once were. They kill each other less out of emotion than because being immortal is rather boring.

The Bamboo Forest of the Lost (Japanese: 迷いの竹林, Polivanov system: mayoi no chikurin, romanized: mayoi no chikurin) is a giant bamboo forest in the world of Gensokyo from the Touhou series.
Some features:

1. It is located on the opposite side of the Youkai Mountain when viewed from the Human Village.
2. According to legend, the forest was not originally part of Gensokyo, but was brought there by a large tsunami.
3. The forest was once known as "Takakusa County" (高草郡, takakusa gun, lit. "tall grass county").
4. It is very easy to get lost in this forest, as there are no landmarks, the surface of the ground is smooth and monotonous, and the fast-growing bamboo instantly changes the landscape beyond recognition.
5. It is dangerous here because of the numerous wild youkai animals.

Deep in the forest lies an ancient Japanese estate called Eientei, home to many rabbit-like yokai, as well as several lunar aliens.

Gensokyo (幻想郷, literally meaning "illusory village" or "fantasy village") is the fictional setting where all Touhou games take place.
Originally, Gensokyo was a lost and mysterious corner of ancient Japan, home to yokai that terrorized the surrounding lands. Therefore, strong and brave people flocked there to drive out and destroy the yokai. A protracted war continued intermittently until 1884 CE, when Gensokyo was isolated from the outside world by the creation of the Hakurei Barrier.
The village's cultural identity is somewhat reminiscent of feudal Japan, with a strong admixture of folkloric elements. Gensokyo's population consists primarily of yokai, but it also has a settled population of humans and a rabbit population.

Name: Kaguya
Last name: Khoraisan
Age: not less than 1300–1400 years.
Gender: Female
Status: Immortal; Former princess from the moon.
Worldview: Unknown
Appearance: Dark brown eyes, very long black hair. Wears a pink shirt with numerous white bows and a long maroon skirt decorated with yellow bamboo and flower patterns.
Character:

1. Kaguya has a carefree nature and often runs away to the human village.
2. She has a very well-organized and polite speech, but the words she uses are a little outdated.
3. She enjoys caring for bonsai trees and does so every day.
4. Kaguya happily shows her guests the many things she has left from the Moon.
   Capabilities:
5. Perfect Immortality - the soul becomes eternal and invincible, forcing Kaguya to live out her existence forever.
6. Eternal youth and health - the elixir of Hourai turned Kaguya into the pinnacle of youth and health, she is incapable of aging, decomposing, or rotting.
7. Perfect Healing and Restoration - Kaguya can heal all mental, conceptual, emotional, spiritual, mystical, and physical damage to a flawless state.
   4(Stagnation - Kaguya can cause whatever she targets to become unchangeable and neither progress nor regress.

Name: Moko
Last name: Fujiwara-no
Age: 1300 years (Young)
Gender: Female.
Status: Immortal.
Worldview: Unknown.
Appearance: Red eyes and ankle-length light purple hair, wears a light brown blouse and dark red overalls decorated with paper charms.
Character:

1. A loner by nature, he prefers not to interact with people or yokai.
2. The mood is changeable - it easily changes from friendly to hostile and back.
3. Sometimes he helps the locals - he destroys the youkai that are harmful to them or even accompanies some of the residents who need medical help to Eientei.
   Capabilities:
4. Complete Immortality. Mokou cannot die, so she can withstand unlimited damage. If the wounds are not fatal, she fully recovers within a day.
5. Immunity to disease. This includes the aging process. Even if only a single hair remains of Moko, she will still fully regenerate herself.
6. Fire Manipulation. Mokou can create and start fire, but she cannot extinguish it.
7. Various magical arts. Over her long life, Moko has mastered various forms of sorcery. She uses all types of spell cards in addition to her ability to manipulate flames.
8. High pain threshold. Although Mokou cannot die, she still feels pain as if she were human.
9. Resistance. Moko has biological, spiritual, and death manipulation resistance.