Show: ONE OK ROCK at Ozzfest Japan 2015, Makuhari Messe Kokusai Tenjijou, Chiba, Japan

Ozzfest Japan is the Japanese edition of the legendary Ozzfest music festival, originally created by Ozzy Osbourne and his wife/manager Sharon Osbourne in the U.S. The Japan version first launched in 2013, making it the first Ozzfest to be held outside of the United States. Held at Makuhari Messe in Chiba, just outside Tokyo, the festival brings together a mix of international heavyweights in metal and hard rock alongside prominent Japanese acts. It has only been held twice in 2013 and 2015. Ozzfest Japan brought together a blend of global headliners like Slipknot, Korn, Black Sabbath, and Slash with leading Japanese rock and metal acts such as ONE OK ROCK, VAMPS, Crossfaith, and MAN WITH A MISSION, all hosted indoors at a major convention venue with high production values and curated in part by Sharon and Ozzy Osbourne to preserve the spirit of the original U.S. Ozzfest.

On November 21, 2015, ONE OK ROCK took the stage at Ozzfest Japan 2015, held at Makuhari Messe in Chiba. As one of Japan's leading rock acts, their appearance on the first day of the festival placed them alongside international heavyweights like Korn, Evanescence, Bullet for My Valentine, Of Mice & Men, and local peers such as VAMPS, SiM, and Crossfaith.

Their performance was already a highlight, featuring a powerful setlist that included Cry Out, The Beginning, and Mighty Long Fall. But what made the night truly special was a surprise guest appearance by Koie (Crossfaith's vocalist). Introduced onstage by Taka as a friend, Koie joined them for a collaborative performance of Mighty Long Fall, creating a memorable moment of unity in Japan's rock scene.