Cost of living in Miyazaki (Japan) is 85% more expensive than in Abuja (Nigeria)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 262 prices entered by 18 different people.
For example, you would need at least 2,866,487 ₦ (¥859,523) in Miyazaki to maintain the same standard of living that you can have with 1,550,000 ₦ in Abuja.