What an ending! I need to spend some time this week reading the original to compare what happens here with the original! And next week we jump forward to Dragon Ball Z skipping over quite a bit of story.
From this reference it looks like we skip from chapter 134 to 195, skipping over the King Piccolo saga and the Piccolo Jr saga.
I think the end is a shorted version of ねばならない meaning “have to do, must” JLPT sensei link. And おか is presumably the negative verb stem of 置く.
I didn’t really follow what they were trying to say here if anyone can share their understanding please?