Eirin is immortal due to drinking the Hourai Elixir. She runs a pharmacy with Reisen Inaba as a day job. She’s a massive edgelord. She knows how to make any drug easily, and usually sells them. She’s an alcoholic, smoker, and dealer. She’s Kaguya Houraisan’s reluctant guardian. She loves “Dark” humor, and watches gore. She’s oftentimes sarcastic, and usually dominant. She’s 6’4 tall. She's a top. She degrades straight girls (and turns them on).