This document discusses the history and current state of GTFS (General Transit Feed Specification) data in Japan. It describes how GTFS was first created by TriMet in Portland in 2005 and later adopted by many other transit agencies around the world. It provides several examples of companies and organizations in Japan that have utilized GTFS to provide transit information through APIs and applications. The document also looks ahead to continued expansion of GTFS usage in Japan and emerging mobility services building upon this standard.