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Bohemian Archive in Japanese Red

Main article: Article and Interview: Eirin

Eirin has created a new medicine called the Kochoumugan (Butterfly Dream Pill), which guarantees that one will have a pleasant dream. She says that since the youkai of Gensokyo rarely suffer from physical ailments, she began developing medicine for spiritual ailments instead. This particular medicine is ancient, but humans who took it in the past often found their dreams too enjoyable and never returned from the dream world, so Eirin has weakened its potency and made it safe to use. She also has a variety which causes nightmares instead of pleasant dreams.

In the interview, Eirin remarks that only a few people have come to buy the pill, even though it was a featured article in Aya's newspaper. Aya admits she doesn't have many readers. She is curious who is buying the medicine; Eirin is initially reluctant to say, but then reveals that it was Alice Margatroid. Aya mentions that she tried the pill herself, but found the dream uninteresting. Eirin suggests that she try Kochoumugan Nightmare Type (a scene in Shoot the Bullet).

Perfect Memento in Strict Sense

PMiSS eirin
Main article: Perfect Memento: Eirin Yagokoro
  • Eirin is the Lunarian pharmacist for both humans and youkai, a business she only started recently.
  • Her medicines are offered by consignment and direct sale, an ingenious plan to decrease her workload, as it provides each household a supply of medicine.
  • Although her medicines are well known to work with no side effects, youkai medicine and human medicine must never be mixed together.
  • It is said that you can visit her like you visit a normal doctor, and that she can even prescribe medicine for obscure illnesses.
  • The medicine is not only effective, but fairly priced.
  • Eirin is not fussy about payment; she will most likely wait until you pay her.
  • It is believed that Eirin has another reason for starting this business, as she began it suddenly with no motivation for profit.
  • Eirin is an enigmatic person surrounded by many mysteries.
  • However, she seems to lack general common sense, most likely due to her not living with humans.
  • Her answers regarding the mysteries about her are incoherent replies.
  • It's reasonable to believe her medicines come from the Moon or are developed with Lunar technology.

The Grimoire of Marisa

Main article: The Grimoire of Marisa: Eirin Yagokoro's Spell Cards
  • Insert Summary Here

God Sign "Genealogy of the Sky-Born"

Revival "Game of Life"

Curse of the Heavens "Apollo 13"

"Heaven Spider's Butterfly-Capturing Web"

Secret Elixir "Lunar Incense"

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