Trying to remember the name of an artist I heard a few songs

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Trying to remember the name of an artist I heard a few songs from many many years ago. I'm a bit fuzzy on whether or not the details are right, but here's a breakdown of what I remember to go on.

>Japanese female lead vocalist
>A mixture of Jpop and electronic style
>One of the music videos features her walking down a hallway wearing fuzzy legwarmers, many doors on either side that lead to hotel rooms with various trippy situations. Later in the video, there's a straight up Nazi rally (although not actually displaying anything Nazi-related, just visually obvious reference)

Any help in rediscovering this artist is much appreciated.

Also, to avoid making a second thread, I'm also trying to remember the name of that one male Japanese artist that was super mainstream and huge in the industry for a few years a while back. He had a very non-dark goth/edgy sort of style about him. I remember one of his music videos had him traveling across a desert in a caravan of some description.