Built in Secret for a Game Boy Advance GPS by Former Metal Slug Creators: Lost JRPG Navinosuke Revived 20 Years Later for Switch and PC
Few stories in Japanese game preservation are as wild as a prototype that quietly predicted the future of mobile gaming before smartphones even existed. More than twenty years after being shelved in the early 2000s, the 2D monster-taming RPG Navinosuke: The Yo-kai Buster is officially coming back to life. Developed by KOHACHI STUDIO under the leadership of legendary arcade pixel artist Akio (renowned for his foundational work on Metal Slug and In the Hunt) and published by Happinet under its Happinet Indie Collection banner, this long-lost adventure is set to launch in 2027 for Nintendo Switch and PC via Steam.
A Secret Game Boy Advance GPS Project Fifteen Years Ahead of Pokémon GO
The origin story behind Navinosuke: The Yo-kai Buster reads like a fascinating piece of handheld gaming archaeology. Back in the early 2000s, a veteran arcade team led by Akio secretly began crafting an ambitious creature-collecting RPG for the Game Boy Advance. What made the project truly ahead of its time was its core hardware hook: the game was originally engineered to pair with an external GPS peripheral attached to Nintendo's handheld, turning real-world exploration into monster hunting roughly fifteen years before Pokémon GO became a global phenomenon.
When plans for the GPS hardware accessory fell through, the project lost its platform hook and was placed into indefinite hibernation despite being deep into production. For over two decades, its intricate sprite sheets and world design remained locked away unseen. Determined not to let two decades of craftsmanship vanish into obscurity, KOHACHI STUDIO and Happinet rescued the original assets and rebuilt the user interface and progression systems for modern hardware, as detailed on the official Navinosuke: The Yo-kai Buster Steam page.
A Karakuri Puppet Exorcist and Over 200 Yo-kai Across Ancient Zipangu
Rather than relying solely on its nostalgic backstory, the game blends classic monster-catching depth with dark Japanese folklore. Set in Zipangu, a fictionalized vision of ancient Japan where the barrier between the human realm and the spirit world is crumbling, the story centers on the clandestine Onmyo Bureau. Desperate to stem the supernatural tide, the bureau constructs its ultimate secret weapon: Navinosuke, an apprentice Onmyoji exorcist built as a mechanical karakuri puppet.
The narrative takes a time-bending twist when the soul of a modern-day human is pulled a thousand years into the past and bound to Navinosuke's journey. Travelling across haunted provinces to resolve supernatural incidents, players will encounter more than 200 unique Yo-kai. While many stand as formidable bosses and roaming threats, players can seal, purify, and recruit these folklore spirits to fight alongside them as loyal companions.
Shikigami Turn-Based Strategy Meets Masterclass Arcade Pixel Art
Combat revolves around strategic turn-based battles governed by five elemental affinities showcased on the official KOHACHI STUDIO website: Fire, Water, Earth, Phantom, and Curse. Through the game's Shikigami system, captured Yo-kai can be trained, evolved, and arranged into specialized party formations capable of countering tough elemental matchups, adding another standout Japanese role-playing experience to our 2027 video game release calendar.
Visually, every frame carries the unmistakable DNA of Japan's golden arcade era. Having previously spotlighted Kohachi's action heritage during our Tokyo Game Show 2026 coverage, seeing Akio's expressive pixel work applied to a sprawling supernatural bestiary is a treat: from mischievous lantern spirits to screen-filling skeletal giants, the animations burst with personality. Slated for a 2027 debut on Nintendo Switch and PC with English, Japanese, Chinese, and Korean language support, this rescued GBA gem is finally getting the worldwide stage it deserved twenty years ago.
Check Navinosuke: The Yo-kai Buster deals on Allkeyshop→
My Perspective
After years of digging through forgotten Japanese RPG archives and classic 2D sprite work, learning the true story behind Navinosuke: The Yo-kai Buster genuinely gave me chills. Realizing that former Metal Slug veterans led by Akio were secretly building a GPS-powered Yo-kai catching RPG on the Game Boy Advance in the early 2000s, a full decade and a half before Pokémon GO took over the planet, is mind-blowing. So many cancelled handheld prototypes from that era vanish forever into lost dev kits, so watching KOHACHI STUDIO rescue more than 200 hand-crafted Yo-kai sprites and bring them to Switch and Steam in 2027 feels like a massive victory for game preservation.
Based on the outskirts of New York City, Chaya 'Chayane' spent five years studying software engineering in Montreal before returning to her home state. A Full-Stack developer and Deep Learning AI architecture researcher, she explores neural networks and algorithmic optimization while engineering data pipelines for Retrocharting and Gamescharting alongside Grimtag. A gamer for over 20 years and an avid collector of Nintendo history and The Legend of Zelda, she explored World of Warcraft's Azeroth before bringing her deep technical background to video game analysis.
