Honda's No. 2 executive Shinji Aoyama has resigned following an allegation of inappropriate conduct.Aoyama's resignation came after the company conducted an investigation into the accusation and prepared a disciplinary action plan.Honda CEO Toshihiro Mibe will voluntarily return 20% of his monthly compensation for two months in response to the seriousness of the matter.A new management structure will be announced by Honda in the near future.