Aneki My Sweet Sister

"Aneki: My Sweet Sister" seems to be a reference to a popular manga and anime series, "Aneki: My Sweet Sister" or more commonly known as "Ane ni Arashi" in Japanese. However, there seems to be another title that is more widely recognized which is "Ototo no Otto" or in English "My Brother's Husband" but that seems not to be exactly what you are referring to.