Well, I wanted Pola so I spent a week in E5 on just easy to clear it. And I gave up on E6 since not anything I tried could get that boss so much get to 10HP left since there's 2 boss tier, 2 lower boss tier and one battleship shielding her. No way you can clear it in just a week. Or you will exhaust all the luck you have in several next year clearing it. There are people done with Iowa now though. Keep up the hope.

"Because there is no notable reward item in the later half sea waters so it is okay."

Keep believing that yourself until you find out those Interceptor Fighters wouldn't turn Summer a total hell (it will be hell anyway).

the sadness when you can relate so much （ｉДｉ）

Demundo said:

Well, I wanted Pola so I spent a week in E5 on just easy to clear it. And I gave up on E6 since not anything I tried could get that boss so much get to 10HP left since there's 2 boss tier, 2 lower boss tier and one battleship shielding her. No way you can clear it in just a week. Or you will exhaust all the luck you have in several next year clearing it. There are people done with Iowa now though. Keep up the hope.

A week should be enough to clear those 3 maps.
I needed only a day each for E6, E7 and E5 (all on easy), but you have to rely on the opening airstrike to clear E6 so that one is very luck based (I needed only 2 attempts with 3CV once on final kill, though).

I feel weird for having completed E-5H in a couple days. (And then E-6E and E-7E in an evening because I couldn't be arsed to deal with uncertain routing and I made the mistake of using Akitsu Maru on E-5)

Ugh, you are rubbing salt on my fresh wounds.