Who are these people walking in packs around Ikebukuro at 0700 in the morning, staring at their phones (sometimes multiple phones) tethered to batteries in their backpacks? Are they in other parts of Tokyo as well?

Who are these people walking in packs around Ikebukuro at 0700 in the morning, staring at their phones (sometimes multiple phones) tethered to batteries in their backpacks? Are they in other parts of Tokyo as well?

by Catcher_Thelonious