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Eirin Yagokoro is a genius of medicine from the Moon, and is able to create the Hourai Elixir. She is living in exile in Gensokyo after choosing to stay with and devote herself to Kaguya Houraisan on Earth rather than take her back to the Moon. She was a very well-known figure on the Moon, having not only been instrumental in the founding of Lunar society with Lord Tsukuyomi, but also being its leading medical mind and the person in charge of the Moon's emissaries to the Earth.

It seems that now Eirin has begun using her knowledge of medicine to act as Gensokyo's premier pharmacist, selling medicines at Eientei ranging from sleep aids to various cures. She is generally a fairly pleasant person and is devoted to serving her best friend, Kaguya, but she does not suffer fools gladly, and because of her incredibly high intelligence, she can come across as conceited, impatient, and condescending at times to those not sharp enough to follow her explanations immediately.

Story[]

During the events of Imperishable Night, Eirin attempted to seal the passage between the Earth and Moon, which becomes open during full moons, by casting a spell that would seal the Earth inside a chamber (similar to a Chinese folktale about a paradise found inside a pot). She only meant to do this to protect both Kaguya and Reisen so that the emissaries coming from the Moon wouldn't be able to reach them, but this did not go unnoticed by the various Youkai in Gensokyo who enjoy the moonlight.

During Silent Sinner in Blue, Eirin spied on the humans to see what they were up to. She requested the Watatsuki sisters to train harder to be able to battle the people from earth. The two sisters successfully defeated the invaders.

Abilities[]

Hōrai Elixir Empowerment: Upon drinking the Hōrai Elixir, Eirin's mind, soul, spirit, body and very existence were permanently altered, granting her the following abilities:

  • Perfect Immortality: The soul is made eternal and invincible, forcing her to live out her existence forever. Immortality unties the soul from the physical body, which is just recreated as necessary, although she still retains bodily sensations and functions. In this sense she is separated from the cycle of life and death, rendering her existence to be completely independent from the concepts of reality, space-time, fate, etc. granting her complete and perfect immortality. The effect is irreversible and cannot be copied or interfered with, she will always be restored to pinnacle condition. 
    • ​Eternal Youth & Health: Hōrai Elixir transformed her to pinnacle youth and health, she is incapable of aging, decaying, rotting, etc. She will never become ill, has no imperfections, possesses a perfect physiology and will never be able to die. 
    • Flawless Healing/Restoration: Heal all mental, conceptual, emotional, spiritual, mystical, physical, any/all damage to flawless/perfect/pristine state. Every injury shall cease; critical injuries will be healed in a matter of days. Complete destruction results in complete restoration. 
    • Clear Mind: She is capable of experiencing emotions regardless of her age, but those feelings do not play a prominent role in her thought processes. Her mental performance allows her mind to operate in the most efficient and rapid manner possible.  Brain waves are always calm, akin to a zen monk. She is completely free from and immune to anxiety, concern, trouble or worries of any kind. She is perpetually content and immune to mental illness, etc. Hence why she can live a quiet, carefree life in the forest in perpetuity with soundness of mind. 
    • Eternal Memory: Her mind has unlimited storage and analytical capacity; able to instantly recall and cross-correlate any information stored with perfect clarity. 
    • Immunity : She is immune to all elements and elemental forces, being completely invulnerable to direct and indirect effects. Seem to be a mechanism that prevents immediate death after revival, in a sense it allows her to be safe and functional any environment. 
  • Medicine Creation: She can create or generate different kinds of medicine including ointments, tablets, elixirs, serums, cream, powders, etc. These medicines could be used to cure numerous amounts of illnesses or prevent illnesses to occur and used for healing and pain suppressant.

Etymology[]

  • The name Eirin means "eternal" (永) (ei) and "jewel, tinkling of jewelry" (琳) (rin).
  • Eirin's surname Yagokoro means "eight" (八) (ya) and "idea, mind, heart, taste, thought, desire, care, liking" (意) (gokoro).
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