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When Takeda Katsuyori (武田勝頼)lost at the War of Nagashino (長篠の戦い), he moved the central place of force in order to prepare against the next invasion. The Shimpu castle was constructed by Katsuyori at that time, but he set fire to the castle before it's completed. After that he escaped to Tano (田野-甲州市 Kosyu city at present)and committed suicide, that was the fall of the Takeda family.
The Shimpu castle is the last one of the Takeda family. The particular construction represents their strength. The castle was built with forts and fosses but stone walls. The castle keep still remains and tells us the history of the family.