Niger followed pool victories over hosts Togo and Benin, and a draw against Mali, with the tight win the final.
Burkina Faso finished in third place after an equally attritional win against the hosts, 7-5.
"This tournament has once again proved a massive success and remains a key part of African rugby’s development," said IRB Regional Development Manager for Africa, Jean-Luc Barthes.
"Year on year, we are certainly seeing the standard among these lesser African rugby nations improve through more regular competition.
"Congratulations to Niger on retaining their Cup and to Togo on hosting a successful tournament."
Final ranking
1. Niger
2. Ghana
3. Burkina Faso
4. Togo
5. Nigeria
6. Mali
7. Benin
8. Togo B
Full results
Final day
7th/8th: Benin 29-0 Togo B
5th/6th: Nigeria 5-0 Mali
3rd/4th: Burkina Faso 7-5 Togo
Final:Niger 5-3 Ghana
Pool A:
Togo 6-5 Mali
Niger 10-3 Benin
Niger 11-11 Mali
Togo 6-5 Benin
Niger 6-3 Togo
Mali 11-0 Benin
Pool B:
Burkina Faso 17-7 Nigeria
Ghana 44-0 Togo II
Burkina Faso 43-0 Togo II
Ghana 5-5 Nigeria
Burkina Faso 7-17 Ghana
Togo II 0-43 Nigeria
