The literal translation of the second half of the line from the third panel is "Let's come here again another time in a cheerful state." That doesn't sound very natural, so I tried to replace it with something that sounded more natural, albeit cheesy.
ahaha right—If we're able to bring peace to this world, Let's come here again with smiles on our faces. ...Yes.so-Sorvey......Someday,Yes...?Well, if it's you and me, that'll be a piece of cake.