星街すいせい 日本武道館 Live Blu-ray

The product you mentioned seems to be a Blu-ray Disc of a live performance by Hoshimachi Suisei, a popular virtual YouTuber (VTuber) from the Hololive Production agency. The title indicates that it was recorded at the Nippon Budokan, a famous venue in Tokyo, and is likely titled "SuperNova" based on the indication in the text.
Hoshimachi Suisei is well-known for her singing talent and gaming content, and performances like these often attract a large audience both in person and through streaming. The Blu-ray would typically include the full live concert, behind-the-scenes footage, and exclusive content for fans.
If you're looking for specific details about the release, such as the setlist, special features, or where to purchase it, please let me know!