Format of Album title / Album artist is used at "submitter's discretion" and it's not reserved only for all those anime singles. This is one of the rare cases where it can be used outside of CD singles - Coeur de pirate is the name of Beatrice Martin's "solo project"; it really means it's her but it's nowhere credited except in the album artist sense:
http://www.daretocarerecords.com/fr/...hild-of-light/
So no harm in keeping it.