No no, I think they mean that they want the entire manga to just be the main couple goofing around until one day one of them arbitrarily decides they're going out and the other one goes along with it.
I watched the movie before reading this. I thought Kumo and Sasori were just weird goons, so I didn't expect them to show up so early. Now that I've seen their story with Ichiro... Damn.
Reminds me a lot of Beard Gorilla in a really good way. I hope there's a sequel oneshot set ten years in the future or something like that somewhere down the line