Long-Lost GBA-Era RPG Navinosuke Returns in 2027 From Former Metal Slug Developers

Happinet and Kohachi Studio announce Navinosuke: The Yo-kai Buster for Switch and PC in 2027, reviving a cancelled 2000s GBA-era RPG from Nazca veterans.

A Japanese RPG that began life more than twenty years ago has resurfaced as Navinosuke: The Yo-kai Buster, now scheduled for worldwide release on Nintendo Switch and PC during 2027. Happinet is publishing the project through its Happinet Indie Collection label, while development is handled by Kohachi Studio, a team containing veterans of Japan's arcade industry and former developers associated with Nazca and Metal Slug. The game was originally developed in secret during the early 2000s but never reached commercial release. Rather than simply distributing an unfinished archive, creator Akio and his team have rebuilt and expanded the RPG for contemporary platforms. Navinosuke takes place in a fantasy version of ancient Japan where the relationship between humans and yokai is collapsing. The protagonist is a mechanical onmyoji apprentice created by an organisation called the Onmyo Bureau. Exploration leads into strategic turn-based encounters against supernatural creatures, with a creature-collection element allowing defeated or persuaded yokai to join the player's side. Visually, the project retains the compact pixel-art character and environments associated with handheld RPG development of its original period. Happinet had previously discussed a 2026 launch, but additional development, a newly confirmed Steam edition, expanded localisation and further improvements have pushed the game into 2027. Languages now planned include English, Japanese, Korean, Traditional Chinese and Simplified Chinese. That worldwide localisation transforms what might otherwise have remained a particularly obscure piece of Japanese development archaeology into an accessible commercial release. Navinosuke is part of a fascinating recent trend in which abandoned games are not merely dumped online but actively completed decades later. Development archives contain countless cancelled prototypes, but most were abandoned because companies failed, publishers changed strategy or hardware generations moved on. Returning to one after twenty years means confronting incomplete assets, ancient tools and design assumptions from another era. Developers then have to decide whether to preserve those limitations exactly or make changes for players who expect contemporary usability. Kohachi Studio describes Navinosuke as rebuilt and reimagined rather than an untouched historical artefact, which is probably the more realistic route for an unfinished RPG of this scale. Its existence nevertheless gives players a rare chance to experience ideas conceived during the final years of 2D handheld development by creators whose professional history stretches back to some of the most celebrated arcade action games of the 1990s.