Endless

Two anime characters with red eyes and a wide grin appear in a split-screen effect against a dark background, followed by a rapid transition to a character with a long ponytail looking out over a starry sky, then a character in a red room with a spiky hairstyle, a group of characters with long hair under a blue sky, and finally a character with white hair and a red mark on his forehead being held by another character against a bright blue sky.