The ex-president of Fujitsu, Kuniaki Nozoe is now threatening to sue the IT services giant, and asking it to sue some of its own executives.
Nozoe is suing for damages and for losses suffered by the company. Fujitsu said its auditors would consider the request within the next 60 days, the BBC reports.
In response Fujitsu issued a bizarre statement which said he'd been asked to quit for having links to another company with "an unfavourable reputation" - which is a not very polite way of referring to the Yakuza.
In fact the board said it had previously warned Nozoe that such links were in conflict with "the Fujitsu Way". Nozoe accepted this and promised to end any relationship with the third party. The board later found he was still working with the dodgy firm and so he chose to resign when confronted.
The board agreed with Nozoe to issue a statement attributing his departure to poor health rather than blame the unnamed third company.
Fujitsu stressed that Nozoe had not broken any law but had failed in his duties as president.
The Tokyo Stock Exchange gave Fujitsu a strict verbal warning over the issue. The company was told that although its explanation of the original departure had been inadequate it had not been enough to mislead investors, which would have brought harsher punishment. ®