Rock in Japan 2026 reveals its 5-day lineup

What happened

At around noon on June 3, 2026 (JST, Japan Standard Time), ROCK IN JAPAN FESTIVAL 2026 — one of Japan's largest rock festivals — unveiled its full performer lineup in one drop. The event runs five days at Soga Sports Park in Chiba (near Tokyo): September 12, 13, 19, 20, and 21, with doors at 8:30 and music from 11:45. Japanese outlets reported 33+ acts added, spanning rock, idol groups, and hip-hop.

Day assignments include Saucy Dog and JO1 (Sept 12), BUMP OF CHICKEN (Sept 13), Number_i and Novelbright (Sept 19), and SiM, Sakurazaka46 and MAZZEL (Sept 21).

Why it is trending now

The spike came from timing: the moment the lineup went public, each act's official account posted its own slot announcement, so fans of very different genres all hit the same hashtag at once. The standout storyline was SiM — a Japanese rock band — playing the festival for the first time, which its official account flagged directly. Ticket lottery sign-ups also opened at the same time, pushing posts even harder.

How fans reacted

Fans celebrated their favorite acts. Number_i supporters cheered a domestic festival return, JO1 fans posted pure excitement, and one performer from the group iLiFE! wrote that they were "shaking" at the news. Several artist accounts urged fans to make summer memories together.

What to watch next:

Watch the ticket lottery results and any second-wave lineup additions, plus daily set times as September nears. With SiM debuting and Number_i returning, the per-day crowds and individual sets at Soga Sports Park will be the next thing fans track.