Rajasthan girl Sapana is the lone woman in the Indian team while Khushbir Kaur, who has also qualified for Rio Olympics, has pulled out of the prestigious continental event due to injury.
National record holder and Asian Games silver medallist Khushbir had limped out of the finishing line after winning the gold in the National Race Walk Championships in Jaipur last month and she is currently undergoing a recovery programme.
Irfan also bettered the Rio Olympics qualification mark in Jaipur last month in his first race after sustaining an injury in the 2014 Asian Games in China.
The other five men racer walkers are Manish Rawat, K Ganapathi, Devender Singh, Sandeep Kumar and Neeraj Singh.
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Race walk head coach Alexander Artsybashev said that the Indian athletes would aim to clock their personal best and further improve their ranking for the final selection for the World Championships in May and the Olympics in August.
The team leaves for Japan from here tonight.