ACSL bet a reported ¥1 billion on Japan's first Level 4 drone certificate — and won

Builds Japanese-made industrial drones with edge-AI autonomy (SOTEN, PF2-CAT3), selling hardware, certification muscle and services for inspection, logistics and defense.

Whoever held the first airframe certificate under Japan's Level 4 regime would own BVLOS-over-people work — a bet worth about ¥1 billion of engineering.

Nikkei Cross Trend reported the Level 4 certification effort cost about ¥1 billion, an all-staff engineering push.

On December 5, 2022, a revised Civil Aviation Act took effect in Japan, creating a type-certification system for drones and legalizing Level 4 flight — beyond visual line of sight, over people, in populated areas. Tokyo industrial-drone maker ACSL, already listed on the Mothers market before the 2022 TSE restructuring, bet the category would be won by whoever certified first. It built the PF2-CAT3 around crash-worthiness and redundancy, and on March 13, 2023 the transport ministry handed it Japan's first Category I type certificate, with the first Level 4 flight targeted for the end of that month.

Nikkei Cross Trend later reported the certification push cost about ¥1 billion and pulled in the whole company. ACSL applied its know-how down the line — a next-generation PF4-CAT3 went into certification and the NDAA-compliant SOTEN launched into the US market. Then the founder nearly undid it: CEO 鷲谷聡之 resigned in May 2025, and a July 2025 special committee report found he had siphoned ¥151.8 million of company money through fake consulting contracts and abused factoring deals to cover more than ¥100 million of divorce-related payments. The company moved toward criminal complaints; the fiscal year ended December 2025 swung to a net loss on the special charges.

Still running — the certified PF2-CAT3 flew Japan's first area-based Level 4 delivery to hospital and municipal rooftops on Shimokoshikijima, Nagasaki, in January 2026, and ACSL trades on Tokyo's Growth market.

Regulation was the product: the hard part was not flying beyond visual line of sight over people, it was proving to the ministry that a design could — and that proof became the scarce asset.

Being first set the template: Japan's first Category I type certificate made ACSL's airframe the default for operators planning Level 4 routes.

The law opened in stages: certification (2023) preceded real area-based authorizations by about three years, so winners had to survive the gap.

Governance nearly erased the win: a ¥151.8 million embezzlement born of the founder's private debts shows how much of a certification moat rests on controls, not code.

A new certification regime is a moat you build before the market exists — ACSL's certificate outlived the founder who bet the company on it. Governance, not technology, nearly broke the winner.

As of January 2026 ACSL trades on Tokyo's Growth market under code 6232, its PF2-CAT3 is flying Japan's first area-based Level 4 deliveries in Nagasaki's Kizuna special economic zone, and the PF4-CAT3 certification is in progress. Following the investigation report, the company is standing up the recommended checks — a nomination and compensation committee and substantive contract review — while pursuing criminal complaints over the embezzlement.