BABYMETAL kicked off a much-anticipated U.S. tour last night in Kansas City, Missouri, but concertgoers at the Uptown Theater noticed something strange in the Japanese kawaii metal band’s performance: the unannounced absence of BABYMETAL member Yuimetal.

Read more:Here’s the band Babymetal were in before they were Babymetal

As reported by Loudwire, BABYMETAL vocalists Su-metal and Moametal were joined onstage by two backup dancers in place of fellow founding member Yuimetal, and no reason was given for the singer’s absence. Now, fans are wondering if Yuimetal is still a member of BABYMETAL.

According to Nikkan Sports, “Yuimetal” and “Yui chan” are currently trending on Twitter in Japan. The BABYMETAL subreddit has listeners theorizing as to Yuimetal’s whereabouts, with many noting that the new design of the band’s official website—as well as the recent music video for new single “Distortion”—seemingly obfuscates the prominence of the three original BABYMETAL singers. See some fan reactions to Yuimetal’s absence below.

Last December, Yuimetal sat out two BABYMETAL shows at Hiroshima, Japan’s Green Arena due to a reported illness. At the time, the group released a statement saying that Yuimetal preferred to not cancel the show, even though she was unable to perform:

“As an entire team, we considered canceling this performance,” the band’s management said. “However, it was Yuimetal's strong desire to not cancel this performance for the fans who were waiting and looking forward to these performances.”

BABYMETAL’s performance in Kansas City on Tuesday reportedly consisted of a 10-song set with no encore, and the group are scheduled to play in Austin, Texas, tomorrow night, May 10. Watch the band’s performance of “Distortion” from the Kansas City concert below.

We’ve reached out to BABYMETAL’s representatives for details on the situation and will update this article with any new information.

BABYMETAL tour dates:

05/10 – Austin, TX @ ACL Live At The Moody Theater

05/11 – Dallas, TX @ House Of Blues

05/13 – Houston, TX @ Revention Music Center

05/15 – Atlanta, GA @ Tabernacle

05/17 – Charlotte, NC @ The Fillmore

05/18 – Nashville, TN @ Marathon Music Works

05/20 – Columbus, OH @ Rock On The Range

06/01 – Nurburg, Germany @ Rock Am Ring

06/02 – Nuremberg, Germany @ Rock Im Park

06/04 – Innsbruck, Austria @ Music Hall

06/05 – Utrecht, Netherlands @ Tivoli Vredenburg

06/09 – Donington, UK @ Download

Watch more: Rob Halford performs with BABYMETAL