According to the Riverside California collection, which is on their website, the ninpo orangequat is not edible, so those who have sweet fruit plants should analyze what they are. Those who have their own harvest, it would be good if you could upload photos for comparison. Here in Argentina I got something that looks like the ninpo from a collector, but it needs to be analyzed more. Mine has round and oval fruit, it stays on the plant for a year without falling off, skin like an orange, very little essential oil, very juicy and acidic like lemon all the time. It is an embryonic monkey and has a leaf shape that is somewhere between a Satsuma and a kumquat. When I can, I will take a photo so you can see, but there is no reliable source here since only this collector has it. By the way, at Riverside there is a photo of the open fruit that does not match what is shown on the plant.