I don't know what this is from. Probably one of the managers' Twitter accounts. It looks like one of the recent DVD magazines, but it can't be considering it was posted last December just a few days after it was recorded. It doesn't even have audio. Anyhow, it's very sweet and self-explanatory and only 45 seconds long, so watch it you monster…
https://www.bilibili.com/video/BV1bJ411v7Ua/