First, it sounds like you've got unsolved personal issues that are going to prevent this from working. Taking good care of your mental health is key to making any business work. Getting off the ground is a marathon, not a sprint, and you need a certain amount of mental stability and long term thinking to ride out the highs and lows that are part of the process.
Second, I'm not sure of your familiarity with Japanese culture or language, but if Japan is quite foreign to you, I'd have thought that's making things much harder.
Last, unless you can afford to and are willing lose all the money, don't mix up your personal wealth in business ventures. It's much better to bootstrap and be learn to be profitable right from the off with tiny amounts of money than lose your life savings because you've no idea what you're doing. Keep your money and the business' money separate and grow slowly.