Talk:World 2/@comment-5032812-20150103212319/@comment-42.114.41.227-20150104083727

Most of the rare drops require you to get S rank, that also means scoring total kill on enemy fleet.

If you have trouble clearing S on boss, try taking south route with 4 FBB 2CV. There's 25% chance to get dead-end, but it's more guaranteed complete kill than north route.

You do need to max your BB and CV's Firepower and Armor though.