Onward Aosima!

A young girl with brown hair and a blue headband, wearing a blue hoodie, looks terrified and points forward, then appears riding a large, muscular, blue dolphin-like creature with human arms and legs that is flying through a bright, colorful sky. The creature flies forward with its arms outstretched, then extends its legs, revealing purple, toothy mouths on the soles of its feet, as rainbow-colored energy beams shoot out from the mouths.