義理の姉
Meanings
1
sister-in-law (elder); stepsister (elder)
Refers to an older sister-in-law (spouse's elder sister or sibling's wife) or an older stepsister. The term 義理の姉 is used for a sister-in-law by marriage, not by blood.
My sister-in-law is very kind and often teaches me how to cook.
My father remarried, so I now have a stepsister.