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| image = Eirin.png | imagewidth = 265px | name = 八意 永琳 (やごころ えいりん)
Eirin Yagokoro | species = Lunarian | abilities = Can create all types of medicine, genius-level intelligence. | age = At least 1500, but is of an incredible age ("much older" than 1400+-year-old Kaguya, was instrumental in the establishment of the lunar capital.) | occupation = Pharmacist | location = Eientei | description =
- (Touhou 8) Dark grey eyes, long grey hair, has a large braid on her back, and carries a strange pair of bow and arrow. Her clothing is red and blue, and is covered with constellation patterns. She also wears something similar to a nurse's cap.
| titles =
- Brain of the Moon (TH08)
- Town Pharmacist (TH9.5)
- Hourai Pharmacist (PMiSS)
| relationships =
- Kaguya Houraisan (Fellow Exile, Mistress)
- Reisen Udongein Inaba (Apprentice)
- Tewi Inaba (Allied Earth Rabbit)
- Fujiwara no Mokou (Indirect Recipient of Eternal Life)
- Sakuya Izayoi (Unknown)
- Watatsuki no Toyohime (Former Student, Distant Relative)
- Watatsuki no Yorihime (Former Student, Distant Relative)
- Alice Margatroid (Recurring Customer)
| appearances =
- Imperishable Night (Final Midboss A, Final Boss A, Final Midboss B)
- Phantasmagoria of Flower View (Ending No. 5, 9, 12)
- Shoot the Bullet (Stage 9-1, 9-3, 9-5, 9-7 Boss)
- Scarlet Weather Rhapsody (Reisen's Ending)
Eirin Yagokoro is a genius of medicine from the Moon, able to create even 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.
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.
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.
During Silent Sinner in Blue, Eirin spied on the humans to see what they were up to. She requested Watatsuki no Toyohime and Watatsuki no Yorihime to train harder to be able to battle the people from earth. The two sisters successfully defeated the invaders.