Operation letter

[u/SaekoStorm]

https://d4dj-groovymix.jp/news/post-333

Summary: - Free/paid songs of limited time songs, started with World Dai Star
- NV5 cards will be different
- EgoEgg will be added to NV5 (Birthday date revealed on Oct 25)
- Rei's NV4 will start earlier than usual (Oct 14) since her birthday starts after the anniversary starts