In honor of the fifth anniversary of Bushiroad's mobile rhythm game BanG Dream! Girls Band Party!, a special two-episode anime will be broadcast and streamed concurrently. The narrative revolves around 'CiRCLE THANKS PARTY!', an occasion dedicated to expressing gratitude to the devoted fans who have backed the bands from the early days at the live house CiRCLE. The 35 girls embark on a frenzied journey to organize the event, complete with delectable food stalls and electrifying live shows. Amidst the preparations, Kasumi and her comrades opt to deliver a brand-new musical piece during the live performance...