Keijo!!!!!!!!

A female character in a white swimsuit stands with her hands on her hips, then the scene cuts to a close-up of her buttocks with a glowing effect, followed by a transition to a group of characters, including one with white hair and a blue bow, and another with dark hair and wide eyes, while a character with orange hair and a black swimsuit appears with text identifying her as "AKA Siren." The sequence ends with a wide shot of the group standing on a platform above water, with the character identified as Siren highlighted by an arrow.