StoryGroup

{
    "id": 0,
    "story_type": "event_story",
    "external_type": "sekai_event",
    "external_id": "string",
    "display_no": 0,
    "title": "string",
    "subtitle": "string",
    "metadata": {
        "property1": "string",
        "property2": "string"
    },
    "created_at": "2019-08-24T14:15:22.123Z",
    "updated_at": "2019-08-24T14:15:22.123Z"
}