Anzen Chitai (安全地帯) was one of Japan's most successful pop bands in the 1980s. Formed in 1973 as the high-school garage band Invader in Asahikawa, Hokkaido, its original members included vocalist Koji Tamaki(玉置浩二), guitarist Yutaka Takezawa (武沢豊), and guitarist / keyboardist Toshiya Takezawa (武沢俊也, Yutaka's brother). Later in 1973, drummer Kazuyoshi Tamaki (玉置一芳, Koji's brother) and bassist Takahiro Miyashita (宮下隆宏) joined.