Wether you like the song or not it’s impossible not to notice the incredible musical prowess of those musicians, they are tight as fxxx

This is actually a Vocaloid cover by Hatsune Miku. Hatsune Miku is not a real person, although she has given several live concerts, also in London. most recently in 2020. Wagakki Band's first album was taken from vocaloid, but they have since written their own songs. This song is about the westernization of Japan, which happened during the Meiji Restoration. Despite having an upbeat, oriental track, the song contains rather dark themes, mentioning guillotines and ICBMs. In addition, the lyrics state things such as "Songs of lament go unheard" and "This is a banquet inside a steel jail cell". This concert was meant to be Daishinnenkai (New Year's Concert / Party) 2021 in January but was postponed to August the same year due to Covid. Thus Manatsu no daishinnenkai (Midsummer New Year concert / party). All the audience had to deliver a negative test, use a bandage, were not allowed to sing loudly or shout, therefore this version lacks response from the audience when everyone is gathered on stage about in the middle of the song. They were also not allowed to sell more than 5k tickets. The Yokohama arena has room for 17k