The Girl in Twilight

The Crystal Radio Research Club, led by Asuka Tsuchimiya, decides to perform the 4:44 ritual. This urban legend, involving a radio player and the Akeyuki Sacred Tree, supposedly transports people to a different dimension. The ritual unexpectedly works, and Asuka and her friends—Nana Nanase, Mia Silverstone, Yuu Tounaka, and Chloe Morisu—are transported to a parallel world, known as a fragment. They meet their parallel-world selves, with Asuka's counterpart, Seriouska, possessing fighting skills and a serious attitude, earning her the nickname Seriouska. The group learns about the threat of the Twilight, which strips parallel worlds of their possibilities, and Seriouska's goal is to defeat the Twilight King, responsible for the multiverse's destruction.