In this series, we'll be telling the story of the Softbank Vision Fund, the $100bn technology venture capital fund that was supposed to revolutionise the world and bring forward a glorious techno-future. The Vision Fund that now looks like it's inflated a massive, unsustainable bubble in tech companies (and companies that pretend to be tech companies). First - the story of Softbank, pre-Vision Fund, and its visionary founder, Masoyoshi Son, who made both the best and worst investments in living memory.