Oh, erinachan is knowledgable in this even though you're a university student ほう エリナちゃん 大学生なのに詳しいな - 映画・海外ドラマ英語字幕翻訳辞書
He was very knowledgable about Yusoku kojitsu (court and samurai rules of ceremony and etiquette) and his diary titled "Nagaoki sukuneki" has been handed down up to date, although almost of his writings were lost in the Onin War.
有職故実に詳しく、日記『長興宿禰記』が今日まで伝わっているが、多くの文物は応仁の乱で失われた。 - Wikipedia日英京都関連文書対訳コーパス