The draw was made before the Cup final of the Cathay Pacific / HSBC Hong Kong Sevens, which was won by Fiji in dramatic fashion, coming back from 19-0 down at the break to beat Wales 26-19.
In retaining their Hong Kong title, Fiji head Pool A in Tokyo and face matches against Portugal, South Africa and Spain.
Wales reached their first ever Cup final in IRB Sevens rugby in Hong Kong and their runners-up place means they head Pool B next weekend with matches against the fourth-placed team in Hong Kong, Kenya, as well as USA and Scotland.
HSBC Sevens World Series leaders New Zealand start in Pool C, where they are joined by hosts Japan as well as Canada and France.
Finally, Pool D features four evenly-matched sides in Australia, Samoa, England and Argentina.
After six of the nine rounds in the 2012/13 Series, defending champions New Zealand lead with 113 points from Fiji in second place (88). Samoa move up to third (84), South Africa fall to fourth (78) and Kenya climb to fifth (72).
Pool Draw | Tokyo Sevens
Fiji, Portugal, South Africa, Spain
USA Eagles, Wales, Kenya, Scotland
New Zealand, Canada, France, Japan
Australia, Samoa, England, Argentina
Men's Eagles Sevens | Tokyo Sevens
vs. Wales - 10:28 P.M. ET Friday, March 29
vs. Kenya - 2:57 A.M. ET Saturday, March 30
vs. Scotland - 5:41 A.M. ET Saturday, March 30