I want Kaizuka City to make an effort to preserve the castle ruins along with their story. I can only think they're not doing any work at all.

There was only an information board about the castle ruins. It's just an ordinary, run-down park. There were no remains either.

A small hill in the middle of a residential area.

+1

The playground equipment is covered in grass, literally 'grass' (lol) 💦

Only enough to imagine traces of the castle ruins from the terrain