46 Okunen Monogatari: The Shinka Ron (fan translated as E.V.O.: The Theory of Evolution) is an RPG, about one step more primitive than the Dragon Quest games published by the same company. You control one character as they progress through the different eras of life on planet Earth, fighting turn-based battles with damage being based on stats that you control directly.
Once you’ve pushed a stat to its uppermost limit, your character evolves into a completely different creature with different abilities in battle. The story itself is somewhat similar to Search for Eden, but much more fleshed out with a lot of different stories for each era that the game explores. And while Search for Eden ends with humanity as the pinnacle of evolution, The Theory of Evolution goes a bit further into the future…
It's a western-style RPG with turn-based combat. Graphics are pretty minimal, but servicable. Strangely, most of the stats, character names and items are in English, while everything else is in Japanese.
You start the game on the titular black rainbow (an ill omen in this world) and have a chance to equip some gear before you're dropped into the game world. Towns are pretty minimal affairs, with a couple of buildings you can interact with, and enemies attack pretty soon after you venture out.
Software compilation for early Disc Station series, limited interaction on the third disc.
The First Disc is Prince of Perisa
The Second Disc is PowerMonger