Four acts use(d) this name: (1) heavy metal from Tokyo, Japan, (2) hard rock from Germany, (3) indie/alternative/power-pop band from the US and (4) Drum and Bass artist from the UK. (1) Reaction (Japan) Reaction was a heavy metal band from Tokyo, Japan, which was formed back in 1983. It was counted among the important band from Kanto (East Japan, Tokyo-Yokohama area) metal movement, alongside heavy metal stalwarts Anthem and Sabbrabells. Kanto movement was seen as a rival movement to the Kansai (West Japan