Mikitani had joined Keidanren, the Japanese business federation in 2004. In June 2011, in the aftermath of the Fukushima nuclear disaster, he quit the federation, announcing his decision via Twitter before sending in his formal letter of resignation, saying it was no longer the same organization he had joined, and he disagreed with its support for continued reliance on the nuclear industry for electricity, and its reluctance to carry out reforms that could help Japan compete internationally. He subsequently pondered setting up a rival body.