From the outside, this appointment-only clothing boutique in Azabu Juban near Roppongi looks like just another concrete office building with a signless door. This exclusive space, which carries only a few articles of precious clothing hanging behind thick-glass displays, was opened by the 33-year-old founder of a tech company as a sort of luxe closet for his closest friends. Not Found is so word-of-mouth that the only way to find this tiny boutique, designed by Masamichi Katayamawhich which sells Japanese designer labels such as Mastermind and Foundation Addict, is to troll the streets of Azubu Juban and ask.