Fukui's comments may be slightly negative for the bond market. He is likely to lay the groundwork for a change in policy as early as April.

Japan has become a saturated market. Nissan brought out a lot of new models over a year ago and so now their sales are weakening.

Nissan is the only major Japanese automaker that has suppliers producing modules and parts in a Nissan factory, which helps cut logistics cost and inventory cost.

Investors feel there is no need to aggressively buy bonds now as yields may continue climbing amid signs of solid economic growth.

An expected political vacuum is not something the market is afraid of.

The synergy GM gets from Isuzu is the biggest among its alliances in Japan because it's buying 200 billion yen of diesel engines every year from Isuzu.