Tokyo Dispatch
Tech
Tokyo DispatchJapan, in English

Saitama governor tells GMO to answer for cloud breach

Ono says the company is part of Japan's infrastructure and must explain itself to the public, as the prefecture's ¥2.8bn arena naming deal nears its launch.

By Newsroom1 min read
Saitama governor tells GMO to answer for cloud breach
Saitama Prefecture Governor Motohiro Ono at a press conference in Urawa Ward, Saitama City, on November 4, 2026. Asahi Shimbun (x)

Saitama Governor Motohiro Ono said GMO Internet Group must live up to its corporate responsibility after a cloud service run by a group company was hit by unauthorized access, telling a regular press conference on Wednesday that he wants the company to explain itself to the public.

"I understand the situation is serious, but I want the company to fulfill its responsibility properly," Ono said. He described GMO as "one of our country's infrastructure" in the network security field, adding that "this is not a matter of damage to a single company."

"I strongly hope they carry out a swift response and explain the situation to the public," he said.

A ¥2.8bn arena deal

The breach has landed while Saitama is deep into a partnership with the group. In March the prefecture signed a six-year naming rights contract for Saitama Super Arena with GMO Internet Group, a value-up naming rights partnership worth ¥2.8 billion in total.

The arena is under renovation. A music festival is scheduled for next April as the opening event under its new name, GMO Arena Saitama.

At a press conference in March, GMO representative Masatoshi Kumagai said the company wanted to "raise the group's brand image" through the arena. The unauthorized access struck a service provided by a group company in the months since.

Ono said the naming contract had not been raised for change. "It is packaged with things like robot development, but I have not heard any talk of wanting to alter it or end it," he said.

“I understand the situation is serious, but I want the company to fulfill its responsibility properly.”Motohiro Ono, governor of Saitama