I don't know anything about the seven characters because I haven't learned any relevant online literature knowledge. If you can provide more background or stories about these seven characters, I will try my best to provide you with relevant information.
Value identification is a key element. In successful Lean 1 stories, companies figure out what truly adds value for the customer. For instance, a furniture maker might find that customizing finishes adds value. Another element is waste reduction. This can be anything from reducing unused materials to cutting down on idle time for workers. And continuous improvement also plays a role. As they implement Lean 1, they keep looking for ways to make things better over time.
I'm not sure specifically as there could be many different 'naruto lean on me fanfic' stories out there. But it might involve Naruto characters relying on each other in various difficult situations, like during a tough battle or in times of emotional distress.