Peridot

The main subject is a yellow, diamond-shaped character who appears in various scenes with other characters, including a black-haired figure and a white-haired figure. Across the loop, the yellow character is shown in different settings—first with a surprised expression, then being held by the white-haired character, followed by a scene where it is being chased, then fighting with the black-haired character, and finally being held by the white-haired character again, with the word "Peridot!" displayed prominently throughout.