noun
second elder sister; next oldest sister
Refers specifically to the second oldest sister among siblings. Used in formal or written contexts; in casual speech, people often describe the relationship with a phrase like 二番目の姉.
次姉は現在、大阪に住んでいます。
My second elder sister currently lives in Osaka.
彼女は三人姉妹の次姉です。
She is the second eldest of three sisters.