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This species had been tentatively identified by Bill Rudman as possible Gymnodoris subflava, and was posted on these websites on 15 June 2003 as Gymnodoris subflava Baba, 1949.
Since 23 July 2015 are pictures of the real Gymnodoris subflava from Japan online, which looks very different. So I changed it on 24 July 2015 into Gymnodoris sp. 15 Genus: Stimpson, 1855.
The genus Gymnodoris is an interesting genus of carnivorous nudibranchs which feed on other sea slugs. This shot shows a specimen laying eggs.