It really depends what time period you are looking at. I am not well-informed in pre-feudal Japan, but I can list at least two examples that conform to what you may refer to as "class struggle", though not necessarily what Marx may have called it.

The Ikko-Ikki were something of a peasant movement, inspired by certain buddhist teachings that all people were saved by reincarnation. Their movement blossomed out of a turbulent period of Japanese history, and a general dissatisfaction with the samurai-dominated society of the day. They would be put down by Nobunaga and his allies as their ideology represented a threat to both imperial and shogunate Japan.

Skip forward a few centuries and you have a semi-democratic Imperial Japan that is, in 1932, somewhat liberal and perhaps even left-leaning. Two coups would pull the government in opposite directions, as the May 15th incident (coup attempt) was launched at least partially due to a fear of communism's growing influence with the elected government. While the coup failed it garnered major public support, and the resulting February 26th incident would ultimately lead to a military-dominated cabinet. Ironically the original conspirators of the 26th were ideologically leftist young officers who believed that elitists within the governing strata were pushing aside the emperor and oppressing the rural farmers. Both were ultranationalistic in ideology and highly pro-military, to the point of jingoism.

What exactly do you mean by class struggle? As in the proletariat versus bourgeois struggle per Marx?

First, "struggle" has two "g's". Second, the question is very vague and rather strange. Do you mean, was there ever any tension between social classes during the entire history of Japan? Then yes. Yes there was.

If you mean class struggle in a Marxian modern context, then of course. Japan was/is a modern country and like all modern societies, experienced class conflict between landlords and tenant farmers and between company management and workers.

There's more but I'm not sure what you're really looking for.