"Play again"? They only seemed to have gone to eat. Nekotofu could at least throw a single line in about "let's go [...] next" or something...
It's japanese use of "to play". It can be used to mean "hang out" as well.
...So then, let's split up here for today.Phew, I'm full...Exactly!This girl...It's great that you liked it!...Sure, if I feel like it.but that was surprisingly a lot of fun...Let's play again!I was worried about what would happen at first,...Mahiro-chan!I'm rooting for you...!I'm back!