The Nihon Kokudo Keikaku Summers (Japanese: 日本国土計画サマーズ) was a professional golf tournament in Japan from 1977 to 1982. It was an event on the Japan Golf Tour from 1978.
^Tournament reduced to 54 holes after fog and rain delays caused the first round to extend over two days; the weather also resulted in the course being shortened from a par 71 to par 67 for the final two rounds.
^Funatogawa won with a par on the first hole of a sudden-death playoff.