mugi why

Two schoolgirls in uniforms stand in a doorway, one raising her hand in a gesture of surprise or greeting, while the other stands beside her. The scene cuts to a close-up of hands cracking an egg over a slice of cake, then to a girl with dark hair looking up in surprise, followed by a shot of her receiving a thumbs-up from an unseen person, and finally a small, grey, turtle-shaped object floating in a corner of a room.