Mashiro-tyan

A young girl with brown hair and a red coat looks up in surprise at a pair of legs, then experiences a series of escalating emotional reactions including shock, fear, and distress, culminating in a scene where she is being held by a boy in a school uniform while another girl looks on. The sequence transitions through surreal imagery of a starry sky with flying saucers and a glowing Earth, and a purple energy field, before returning to a normal setting.