Dragon’s Heaven (ドラゴンズヘブン) is a cancelled JRPG that was in development by Digitalware in the late ’90s, planned to be published for the Super Famicom and later on the Sega Saturn by Data East (?). We found out about this unreleased RPG thanks to Video Games Densetsu, which found some images on old japanese gaming magazines, such as Sega Saturn Magazine (November 1996).
As you can see from artwork and screenshots, the game was heavily inspired by Dragon Quest, Breath of Fire and Akira Toriyama style. Turn-based combat were shown in a top-down isometric view, featuring at least 5 playable characters at the same time.
As noticed by Matthew Callis on Twitter, it seems the project was originally conceived as a SNES project, as seen in another japanese magazine he found. From what we were able to gather online the game was based on a roleplay novel (where readers could choose how to proceed with the story?) serialized in Maru-Katsu Super Nintendo gaming magazine, possibly as a parody of classic 16 bit JRPG. Later the series was also used to create a tabletop RPG book series published by Kadokawa Shoten.
We can speculate Digitalware tried to use the popular roleplay novel conceived in Maru-Katsu magazine to create a new roleplay video game, first on the Super Famicom and later on the Sega Saturn. For some reasons, the project was canned on both occasions, and then forgotten by everyone.
If you could read the description in these japanese scans, please let us know if there are more details about this lost project!