>>715596386
I recommend this one. It was extremely easy. You just go.
Koharu heals the radiator -> Shiroko fishes the bos -> Hibiki bombs the boss
The iceberg starts with a shield but after a few seconds it blows up and only has 30% HP. When that happens, immediately fish the iceberg and heal the radiator(when the iceberg is already destroyed), this puts it immediately in overdrive and makes your Recovery go zooooom.
It's an extreme clear that just works.