An announcement by Japanese authorities has revealed that Mr Naka was arrested as the third suspect in an insider trading case regarding the video game Dragon Quest Tact. Reportedly, Mr Naka knew about the existence of the game while was employed at the game’s publisher, Square Enix, before the game’s was officially announced.

Before it was revealed that the game would be a joint project between Square Enix and developer Aiming, Mr Naka purchased 10,000 shares of Aiming stock worth some 2.8 million yen (£16,600) with the presumed intention of selling the shares once their value grew upon the news becoming public.