In 1563, Nobunaga moved his headquarters from Kiyosu to Komaki. This was an important strategical move since Kiyosu was just too far to wage war against the Saito. Komaki was closer to Mino.
I took the two pictures almost ten years ago and was sorely disappointed. It was one of the worst castles I have ever been and felt lost. However, that being said, you will be rewarded nicely if you visit the Komaki battlefield instead. The only positive point I have with the castle is when you are on top of the mountain, you can a nice view of the city.
The story goes that Nobunaga wanted to move to Komaki, but he knew his retainers were not in the mood to relocate. So Nobunaga suggested Ninomiya. His retainers refused to move there since Ninomiya was very steep and constructing a castle would be difficult. Then Nobunaga suggest his first choice Komaki. His retainers could not refuse their lord for a second time and approved Komaki. In the end, Komaki was built and everybody moved there in 1563.
Nobunaga only stayed in Komaki for a brief time. His objective was Mino and finally he achieved his goal in 1567. Ota Gyuichi's Shincho-Ko ki Introduction book, Chapter 42 has the story of Komaki.
Nobunaga no tame!