This document provides an introduction to doing business in Japan from the perspective of Marvelous AQL Europe. It discusses Marvelous AQL as a Japanese mobile, console and web game publisher. It notes that the mobile business is extremely strong in Japan with high ARPU. While Japanese and Western mobile games evolved differently, they are now converging. The document offers advice on Japanese business culture, which values consensus, politeness, and long-term relationships over contracts. It also notes opportunities for Western developers in the Japanese mobile games market.