Former IZ*ONE member Yabuki Nako is a certified ONCE!

Back on April 24, TWICE successfully wrapped their three-day concert at the Tokyo Dome in Japan. Also on this day, Nako took to her official SNS account to upload a photo of her attending TWICE's last day concert, wearing the official TWICE shirt and carrying a Jihyo fan, with the caption, "#TWICE_4TH_WORLD_TOUR I went to see the performance in Tokyo."

The day before Nako attended the live concert, she uploaded a screenshot of her listening to TWICE's songs on her Instagram story, saying, "Feels like I'm at Tokyo Dome."

Fans are loving Nako's admiration for TWICE, commenting,

"Our ONCE president."

"The most successful ONCE."

"Nako still being the biggest fangirl ever."

"The biggest ONCE I know."

"Nako is indeed a ONCE."

Meanwhile, TWICE is set to release their fourth full-length Japanese album 'Celebrate' on July 27.