Collector interest
Oni III Kuro no Hakaishin closes Bandai's trilogy on a darker arc and a wider roster, and it is the costliest entry to secure. Its value, clearly above the first two Oni games, points to a smaller late print run, typical for the tail end of a low-profile Japanese Game Boy series. For the collector chasing the full set in its original language, this third number is the hard lock that decides completion.