The streaming of the Touhou 20th anniversary party is still ongoing, but Butaotome did their contribution (they were the first guests). They talked/introduced themselves, showed Machibito wa Kozu.’s PV and also performed it, along with Kakoinaki yo wa ichigo no Tsukikage.

Here is a video: [2019 edit: the link didn’t survive the moving from Tumblr to WordPress and I don’t know if it’s up somewhere, sorry]

Butaotome appear at 39:55, extra part at 1:34:10