It was sold as 'the game that will close out the Dreamcast.' Two more games came after it.
Sega had stopped manufacturing the Dreamcast in 2001. Five years later, in March 2006, a small studio called G.rev put a new shoot 'em up on the shelves for it anyway. G.rev had formed in July 2000, when staff who had built Mega Blast at Taito left after that company pulled out of arcade development. UNDER DEFEAT started life as an arcade release in October 2005, five months before the Dreamcast port arrived, and its release had already been pushed back once — the original date clashed with a rival vertical shooter, Radirgy. The Dreamcast box carried a line of its own: 'This is the game that will close out the Dreamcast.' By the time it shipped, most of the work — outside a few outsourced boss characters — had reportedly been handled by a team of only two people. The claim didn't hold. Two more shooters, Trigger Heart Exelica and Karous, followed it onto the same console. The player's craft in UNDER DEFEAT is a prototype aircraft, model VKL5.03(P) — a machine that, officially, was never meant to exist either.
About this game
UNDER DEFEAT is a 2006 shoot 'em up for the dreamcast, developed by G.rev.
The Story Behind
UNDER DEFEAT was developed and published by G.rev, a studio founded in July 2000 by former Taito staff who had worked on Mega Blast, after Taito withdrew from arcade game development. G.rev's name derives from 'G.revolution'; its president is Hiroyuki Maruyama. In 2004, the studio contributed to Treasure's Gradius V for PlayStation 2. UNDER DEFEAT first appeared as an arcade release published by Sega on October 27, 2005, and G.rev brought its own port to Dreamcast on March 23, 2006 — nearly five years after Sega had ended production of that console. Several late-period Dreamcast shooters, including this one, were able to reach the console that late in its life in part because Dreamcast hardware shared its underlying architecture with the NAOMI arcade board, which kept the cost of porting arcade titles low.
Tricks & Tales
The Dreamcast release carried the tagline 'This is the game that will close out the Dreamcast' — a claim that didn't survive contact with the calendar, since two more shooters, Trigger Heart Exelica and Karous, followed it onto the same console. The player controls a prototype aerial tank designated VKL5.03(P), a helicopter-type craft with a rotating nose that lets it aim independently of its flight direction, in a vertical shooter that separates ground and air hit detection across a fully modeled terrain. Development was reportedly carried out by a team of only two people at G.rev, aside from a handful of outsourced boss character designs. The original release date had to be pushed back after it turned out to clash with the launch of a rival vertical shooter, Radirgy.
Collector's Guide
Region & Compatibility
The Dreamcast enforces a regional lockout by software, with discs manufactured for Japan (NTSC-J), North America (NTSC-U), and Europe (PAL) each restricted to their respective consoles. Most Japanese Dreamcast games output at 60 Hz over composite or S-Video, which works on NTSC televisions worldwide; VGA output bypasses the TV standard entirely and is supported by the majority of titles, making a VGA box or HDMI adapter a practical solution for overseas buyers. PAL-specific titles are the exception: a minority of PAL games do not support VGA or force 50 Hz, so checking compatibility lists before purchasing PAL software for use on a Japanese console is advisable.
Maintenance Tips
The GD-ROM drive is the Dreamcast's most common point of failure — the laser lens wears out faster than those in most contemporaneous CD players. If games freeze, fail to load, or the drive makes repeated seeking sounds, the lens is the first thing to check. Clean it gently with a cotton swab lightly dampened with 90%+ isopropyl alcohol; do not press hard or use high-speed cleaning discs, which can scratch the lens. Compressed air is useful for blowing dust out of the drive bay and the fan area. The console's internal clock is maintained by a rechargeable ML2032 coin cell — the correct replacement type is ML2032 (not CR2032, which is non-rechargeable and can be damaged by the console's charging circuit).
Going deeper
Explore the machine this game ran on, and what to check before you buy or care for one:
What to Watch Out For
Before buying, these are the points worth knowing — from someone who handles original Japanese UNDER DEFEAT copies regularly.
Will a Japanese Dreamcast copy of UNDER DEFEAT work on a North American or European Dreamcast?
It may not boot without modification. Dreamcast has regional differences (NTSC-J for Japan versus NTSC-U/C and PAL elsewhere), and this game was never released outside Japan. Boot disc solutions and region-free BIOS options exist for Dreamcast, so check compatibility with your specific console before buying.
There's a 'Limited Edition' listed alongside the regular release — what's the difference?
The Limited Edition reportedly includes a stage select option, remixed soundtrack, and a gallery of extra content not present in the standard release. The exact contents of the limited edition packaging haven't been independently verified item-by-item, so check the listing carefully before buying.
What does this game typically cost secondhand?
As of a 2026 market check, one Japanese specialist retailer listed a used copy at around 11,100 yen including tax. UNDER DEFEAT is a late-era, lower-print-run Dreamcast title, so it tends to run higher than most Dreamcast shooters.
Before You Buy
Things worth knowing before you buy UNDER DEFEAT
A short checklist for buying a used Dreamcast disc wisely — useful with any seller, anywhere.
-
Choose a seller who tests it before shipping
A copy that has actually been powered on and checked is a known quantity. An untested one is a gamble you only settle after it arrives.
Look for a seller who states it was function-tested and says what they confirmed. A serious seller can tell you exactly what was checked.
-
Check the disc for scratches
Deep scratches on the playing surface cause freezes and read errors. Light surface marks are usually fine.
Ask for a clear photo of the disc's underside. A seller who tested it will confirm it loads and plays through.
-
Make sure it fits your console
This is a Japanese Dreamcast GD-ROM. The Dreamcast is region-locked, so a Japanese disc generally needs a Japanese console.
Play it on a matching Japanese console or a region-free system, and confirm the listing states the region.
-
Saves use a VMU — no disc battery
Dreamcast games save to a VMU memory card; the disc itself has no battery.
Make sure you have a VMU with a working battery and free blocks.
-
Read the seller's reviews and return policy
A 100% positive record across thousands of sales is close to a guarantee — packing, communication and problem-solving all work for everyone. A return policy protects you if something is off.
Read the feedback and confirm a clear return window before you buy.
The last step before buying anywhere is knowing what it's worth.
See what we have in stock →Unexpected Discoveries
Games you weren't looking for — but might be glad you found.
Rooms this game lives in
Wander deeper — explore the themed rooms where UNDER DEFEAT sits alongside its kin.
Memories from around the world
This is a young museum, and this page is still waiting for its first voices. The memories people send reach Taisei personally, and the ones that move him find a home here over time — always with the writer's blessing. Yours could be the very first for this game.
Share your memory ↑