Keith Earls, Dan Leavy and Jack Conan all scored double for Ireland as they completed a 22-50 convincing win over Japan at Shizuoka Stadium on Saturday.
Japan came up with a four try performance as they defeated South Africa by 10-22 in the final in Hong Kong and secure a berth in the Women's Sevens series.
The World Rugby Women's Sevens Series Qualifying kicked-off on Thursday in Hong Kong with Japan, Belgium and South Africa topping the respective pools.
Replacement fly-half Sam Davies kicked a drop goal in the final minute to snatch a 33-30 victory for Wales from Japan at Millennium Stadium on Saturday.
Wales interim coach Rob Howley insisted not to exert any pressure on Ospreys wing Keelan Giles as he is set to make his Test debut from the bench in the upcoming autumn international against Japan at Millennium Stadium on Saturday.
It may feel like the latest Rugby World Cup cycle is only just beginning, but already the prospect of seeding for the 2019 edition of the tournament looms ominously on the horizon.