$Mitsubishi UFJ Financial(MUFG.US) $Mitsui & Co.(MITSY.US) $Sumitomo Mitsui Financial(SMFG.US) $Itochu Corporation(ITOCY.US) $Marubeni Corporation(MARUY.US) In the investment field, Warren Buffett's every move is closely watched. His investment in Japan's five major trading companies - Mitsubishi Corporation, Mitsui & Co., Sumitomo Corporation, Itochu Corporation, and Marubeni Corporation - not only demonstrates his unique investment vision but also provides us with an important perspective to understand future economic trends. An in-depth analysis of this investment case...