ARO [鴉鷺] is a band created in 1977 and mostly consisting of Emiko Shiratori (vocal, lyrics, composition, some instruments) and her husband Sumio Shiratori (composition, producer, some instruments).
Both can be seen on LP obi and Marine Snow EP back cover (same picture):
https://auctions.c.yimg.jp/images.au...bcvj230542.jpg
Band members would vary from 4 (first LP) to 5 (from 2nd LP) but ARO is mostly Emiko and Sumio as imply on their 1988 best of back cover:
http://img03.aucfan.com/item_data/im...60301073.2.jpg