ヨルシカ
There were no talks or band introductions, only story-like videos and performances. They usually don't show their faces, and although I went expecting to see them, they were too far away. You might be able to see them even from distant seats if you bring binoculars. But since they originally don't show their faces and don't appear in the media, this live format didn't feel out of place at all. Most of all, the volume and high notes were amazing.
Source: Wikipedia