This paper quantitatively examines the Japanese new FTAs under the trade war. It employs the general equilibrium approaches to not only investigate the economic structure of each country trade flow but also address the FTAs and the impacts of the welfare and sectoral value chains of the trade war. Essentially, the paper scenarios depend on the official list of the FTAs and the trade war-related goods. As a result of the FTAs under the trade war, the new Japanese trade agreements have provided some opportunities for its market as well as targeted countries. For instance, the Japanese benefit from the EU-Japan FTA would be $4.11 billion U.S.D. and the EU would gain $768 million U.S.D. within the 15-year. The US not only would get a huge advance but also could get back its export market share from Pacific island nations in Japan when Japan would eliminate the tariff on concerned sectors for the US goods. For example, the US and Japan would improve their welfare by $4.09 billion U.S.D. and $398 million U.S.D., respectively through the limited USA-Japan FTA. That is, the US market would comparatively earn much more than Japan. Lastly, those who participate in the FTAs would boost their GDP, welfare, and value-added (productivity). For example, not only would Japan provide some opportunities for its market and then enhance its welfare and GDP, but also the EU and the US would boost their macro variables. However, from the perspective of the other regions/countries, those regions/countries which are not in the trade deal could lose their export market share in Japan, the US, and the UE28 and would, therefore, hurt their GDP and welfare.