Irohakai Shōtengai (いろは会商店街) is a covered shopping arcade that fills most of a 370 meter street at the center of the neighborhood formerly known as Sanya (山谷), though its official postal address is now Nihonzutsumi 1-chome in Taitō Ward. A business association was created in 1919 and businesses had been setting up on the street even...