Talk:Valentine 2018 Event (US)/@comment-195.146.248.152-20180128164251/@comment-26333303-20180130061934

I don't think she meant "sibling" exactly. I think she meant to refer to you in a "I'm older than you, and I think you are younger and cute" kind of way. Since the main character can be either a boy or girl they had to choose a gender-neutral term too. They should have said student ...or maybe kohai? Nah... but she means she looks out for you because she has lived a little longer and has more wisdom.

At least from the things she usually says, I don't believe she thinks you are literally a bother or sister. Tough translation and culteral connotation at work here, I think.