(it's still hikaru_genji but using my Musicals account to comment with a very appropriate Sunset Boulevard icon xD)

Why yes, that's Yumiko. :D This is going to be super fun too. I believe she's going to play Betty in this production. :)

Here's another article with a large picture of Yumiko and Touko. :)

Now I'm sad I can't see it live.

I'm saddened of this, plus I doubt there would be a recording. There should be a recording because this is the first Japanese production of Sunset Boulevard. We already have like plenty of Phantom and Les Mis Japanese recordings (plus Elisabeth) that there hasn't been any for other Broadway/West End/European shows (a complete Rebecca recording plus the recent Chess concert with Liv Moon springs in mind).