A former elementary school in Takikawa, about an hour northeast of Sapporo, now houses one of Japan's more unconventional bets on the future of rocketry. That's where Letara, a six-year-old startup spun out of Hokkaido University, has been test-firing hybrid engines that burn solid plastic fuel with liquid oxidizer. The company disclosed August 20, 2026 that it raised roughly ¥2.6 billion (around $16 million) in a Series A round, money intended to move the technology from ground tests to orbital demonstrations and, perhaps more ambitiously, into Japan's expanding defense market.
Headline Asia, JIC Venture Growth Investments, and Incubate Fund co-led the round. Ten strategic investors joined, among them Aozora Corporate Investment, automotive parts maker Toyoda Gosei, and Frontier Innovations, a fund tied to the Japan Aerospace Exploration Agency. For a young company working in a propulsion niche that has frustrated engineers for decades, the investor lineup suggests momentum, or at least curiosity.
Plastic and Oxidizer
Hybrid chemical propulsion occupies an awkward middle ground. Solid rockets are simple but inflexible once lit. Liquid rockets offer control but demand complex plumbing and cryogenic handling. Hybrids combine a solid fuel grain with a separate liquid oxidizer, theoretically gaining some advantages of each. Letara's pitch rests on safety: because the plastic fuel isn't classified as explosive on its own, handling and storage become less fraught.
The company uses a CAMUI (Cascaded Multistage Impinging-jet) grain design that originated at Hokkaido University, where co-CEO Shota Hirai and his team began work before formally spinning out in June 2020. In an August 21 interview with TechCrunch, Hirai framed the funding as a step beyond proving the thruster can fire in orbit. "We're moving into a much wider set of use cases across both the space domain and the defense and security domain," he said.
Letara's commercial backlog has grown more than tenfold since a December 2024 seed extension, according to Headline Asia's August portfolio update. The company declined to specify contract values but confirmed orders from rocket and satellite manufacturers, as well as the Japanese government.
The technology targets two markets. For satellites, Letara is building compact, restartable thrusters designed for orbit-raising maneuvers. Large spacecraft require high thrust when transitioning from low Earth orbit to geostationary orbit, Hirai noted, particularly when racing through the Van Allen radiation belts. For launch vehicles, Letara and partner Innovative Space Carrier aim to fly Japan's first large-scale hybrid rocket by 2028, per an April 14, 2025 announcement. The two companies completed a joint combustion test of a CAMUI-type hybrid engine on July 1, 2025.
Government Programs and Policy Shifts
Letara didn't materialize in a vacuum. The startup joined the Ministry of Economy, Trade and Industry's J-Startup cohort on March 13, 2025, and received JAXA Partner Startup certification on November 4, 2025. A separate grant from the New Energy and Industrial Technology Development Organization, awarded in June 2025 under the DTSU program PCA phase, brought up to approximately ¥1.0 billion to fund a planned 2026 in-orbit demonstration. An earlier NEDO award during the STS phase in fiscal 2023–2024 totaled ¥236 million.
Tokyo's broader space strategy has become hard to ignore. The government launched a ¥1 trillion Space Strategy Fund in 2024, aiming to double the domestic space market to ¥8 trillion by the early 2030s and enable 30 rocket launches annually, Aviation Week reported in September 2025. Defense spending has increased substantially in recent years, with Aviation Week citing a 67 percent increase over a multi-year period. Then, on April 21, 2026, Japan eased export restrictions to permit lethal weapons sales, though only under specific agreements with partner nations, a major policy reversal that The Japan Times documented.
Letara's investor group reflects those trends. Toyoda Gosei first disclosed an investment on July 26, 2024. Insurers Mitsui Sumitomo and Mitsubishi UFJ Capital participated in the Series A, as did Frontier Innovations, which initially joined Letara's seed round on June 6, 2025. JIC Venture Growth Investments confirmed its involvement via the JIC Venture Growth Fund 2 in a separate August 20 press note.
Scaling Challenges
Hybrid rockets have a long history of promising much and delivering incrementally. Virgin Galactic's SpaceShipTwo burned HTPB rubber fuel with nitrous oxide for years before the program paused in mid-2024, according to SEC filings. Norway's Nammo flew the Nucleus sounding rocket to 107 kilometers on September 27, 2018, ESA reported. Scaling hybrids for orbital missions remains tricky. Low fuel regression rates, combustion instabilities, and mixture-ratio shifts as the solid grain burns down have all posed obstacles, per academic reviews published between 2021 and 2024.
Field results offer contrasting examples and outcomes. Germany's HyImpulse successfully launched the SR75 suborbital hybrid rocket from South Australia on May 3, 2024, and is now developing the SL1 orbital variant. Gilmour Space's Eris Block 1 hybrid-dominant stack failed on its maiden attempt in Australia on July 29, 2025, after a thrust loss at T+9 seconds, a company investigation update from April 24, 2026 shows. South Korea's INNOSPACE flew the HANBIT-TLV suborbital hybrid on March 19, 2023, and continues orbital development. Singapore's Equatorial Space has been running ground tests of its HRF-1 fuel motors through 2026.
Letara's technical differentiation, the company says, lies in proprietary manufacturing of plastic and rubber fuels to ensure reliable ignition and consistent burn. The startup holds patents on low-power arc-discharge ignition devices (WO2026023664A1 published January 30, 2026, and US20240263600A1 published August 15, 2024, both listing co-CEO Landon Kamps and CTO Harunori Nagata as inventors). A 2022 paper in the journal Aerospace detailed large-scale CAMUI modeling. Earlier work at Hokkaido University demonstrated CAMUI hybrid engines in multiple configurations between 2003 and 2012. One JAXA repository paper documents a 28-watt ignition demonstration for electroconductive fuel.
The company converted the former school in Takikawa into a hybrid propulsion test site during the NEDO STS phase, according to a June 24, 2025 announcement. LinkedIn updates in 2025 and 2026 mention a 5,000-newton-class hybrid engine milestone reached in a July 2025 combustion test. Letara's site describes palm-sized engines and 3D-printable fuels. The company declined to disclose engine performance metrics such as specific impulse or thrust-to-weight ratio, which would help benchmark the hardware against liquid and solid competitors.
Defense Ambitions
Hirai's August 21 remarks to TechCrunch marked the first public acknowledgment of defense as a target sector. The timing tracks with Japan's April 2026 export easing and rising defense budgets. Export controls remain in place, however. The Missile Technology Control Regime classifies complete rocket systems and engines as Category I items subject to international licensing. U.S. ITAR places launch vehicles and rocket motors under USML Category IV, according to State Department guidance. Letara has not disclosed defense contract negotiations or overseas export plans.
The startup did announce a business alliance with ANA Trading, a subsidiary of ANA Group, on March 11, 2025, to strengthen overseas sales with a focus on the U.S. market, per ANA Trading's release. Letara attended SpaceCom Orlando in January 2026, LinkedIn updates show. The company's website lists offices only in Japan.
Market forecasts suggest room for diverse propulsion options. The Business Research Company pegged the space propulsion market at $16.84 billion in 2026, growing to $30.48 billion by 2030 at a 16 percent CAGR, in a June 12, 2026 report. Grand View Research estimated satellite propulsion systems alone at $11.05 billion in 2024, rising to $23.24 billion by 2030. Fortune Business Insights projected hybrid rocket propulsion specifically at $2.6 billion by 2032, up from $848 million in 2024. The NewSpace Index counted 216 small launcher entries at the 2025 International Astronautical Congress, a survey updated July 31, 2026 shows, pointing to fierce competition even as demand climbs.
NASA's May 2026 Small Spacecraft State of the Art report noted Rocket Lab's Electron as the most-used small vehicle and highlighted growing platform sizes and launch cadences. The report observed expanding small spacecraft propulsion diversity, suggesting room for niche players who can differentiate on safety, cost, or schedule.
Hardware Still Untested in Orbit
Letara plans an in-orbit firing test with an overseas partner in the second half of 2026, TechCrunch reported, citing the company. NEDO's grant of up to ¥1.0 billion supports that mission. The Innovative Space Carrier partnership adds a separate timeline. A 2028 first flight for a Japanese hybrid rocket, according to the April 2025 announcement. ISC CEO Kojiro Hatada said the company is pursuing agile rocket development and will accelerate efforts to add hybrid engine technology as an option through the Letara collaboration, a PR Times release shows. Kamps said Letara will contribute to a competitive Japanese rocket via practical implementation toward the 2028 flight.
Before the Series A, Letara had raised cumulative funding of ¥1.8 billion from both equity investment and grants, per a March 11, 2025 newsroom post. The March 2025 extension brought in ¥650 million. The June 2025 seed addition totaled ¥800 million. The company declined to disclose valuation. LinkedIn showed 51–200 employees as of August 29, 2026, with 41 individual profiles listed.
Japan has not yet produced a successful private orbital rocket. Space One's solid-fueled Kairos failed on its March 13, 2024 debut and twice more in late 2024 and March 2026, The Japan Times and other outlets reported. Interstellar Technologies continues static fires of its liquid-propellant ZERO vehicle, with a first orbital attempt targeted after 2026, the company said.
Letara's hybrid approach offers a third propulsion architecture, one the startup believes can compete on safety and simplicity. Whether that thesis holds depends on hardware performance in the high-radiation Van Allen belts Hirai cited, and whether paying customers in space and defense sectors value plastic fuel enough to bet on it. The converted school in Takikawa is a long way from orbit, and the real test of any rocket technology happens when the engines light under flight conditions. That demonstration, assuming the schedule holds, is a few months away.
