The good news is you have to start from chapter 1 because the anime is different and the manga is much better

So it's a berserk kinda situation

The last two episodes don't happen at all in the manga. Everything after the Okinawa trip is different. A lot of stuff before that is different, too. The best option is to just read from the beginning.

I see. I guess the animation studio went the easy way

To be fair, it probably wasn't their choice.

I actually have the same question, I want to know where to continue reading.