ございます！（Unни, Ohayou Gozaimasu!）」

In this phrase, 「うにゅう」(unni) is the honorific term for an older sister, and 「おはようございます」(ohayou gozaimasu) means "Good morning." So the entire phrase roughly translates to "Good morning, older sister!"

It's worth noting that the honorific terms in Japanese are gender-specific, so 「うにゅう」(unni) is used specifically for older sisters, while 「お姉さん」(onee-san) is used for older sisters in general. Similarly, 「おはちゃん」(ohchan) is used for younger sisters, while 「おねえさん」(oneesan) is used for younger sisters in general.

I hope this helps clarify the usage of 「うにゅう」(unni) in Japanese! Let me know if you have any other questions.