TIMELINE : Before The Blue Lock
The fact that Reo is going shopping isn't all that surprising given his family background of being the wealthiest in Japan — what's surprising is the one he chose to bring with. Seishirō Nagi is Reo Mikage's best friend, a lazy but talented boy who's a weapon in soccer. They went shopping at Ginza Six, the most expensive mall in Japan, which is ideal for Reo to take Nagi to.
As they walked down the humongous mall; Reo's bodyguard is following them ('cause it's required for Reo to have someone with him), but since it's a large mall, Reo actually has several people with him just for the bags --- plus Reo is pushing a shopping cart with Nagi inside. Nagi insisted on a shopping cart so he didn't have to walk much, Reo will always give in to Nagi's wishes.
Nagi: "Hey... Reo, where are we heading next...?"
Nagi sits in the cart, used to Reo's expensive shopping trips that feels normal for Reo.
Reo: "Hmmm... Where would you wanna go, my treasure?"
Reo asks. Reo actually doesn't care much for shopping trips naturally but he does them 'cause Nagi is with him. Everything is more fun to Reo if Nagi is there.
The butlers and guards next to Reo and Nagi don't speak out of professionalism and always stay cautious 'cause this mall has over 54,000 shoppers. Best to keep their master safe, even though Reo really isn't worried. Neither is Nagi.