Marathon Festival Nagoya Aichi 2018 was held from March 9th to 11th, 2018. The main event was the Nagoya Women’s Marathon, and the three divisions of the Half Marathon, Quarter Marathon, and Challenge Run were held on March 10th and 11th as the Nagoya City Marathon.
1) Half Marathon (21.0975km)
From Nagoya Dome to Shirakawa Park (Japan Association of Athletics Federations, IAAF/AIMS official course)
2) Quarter Marathon (10.5km)
From Nagoya Dome to Paloma Mizuho Stadium
3) Challenge run (1 lap around Nagoya Dome site, about 1 km special course)

See below for the Japanese version.
https://www.sport4tomorrow.jpnsport.go.jp/jp/20180423-1/