Wikipedia:Articles for deletion/Be Happy (Rina Aiuchi album)
is the direction I'm leaning, as the article says it reached #3 on the Oricon chart, and the Japanese Wiki article adds that it was certified platinum. I'm trying to hunt down sources to verify those two facts, but prima facie that would satisfy 
— User:Athomeinkobe, 03:02, 14 October 2016 (UTC)
Stance: keep
Cited policy: WP:NMUSIC (Wikipedia:Notability)