Japanese castles I've visited: #86 Shoryuji Castle in Kyoto.
Japanese castles I've visited: #66 Nakagusuku Castle in Okinawa. A quite impressive castle ruin. Love the style of castles in Okinawa.
Japanese castles I've visited #56: Maruoka Castle in Fukui Prefecture. This is one of the 12 original castle structures in Japan.
Japanese castles I've visited: #32 Imabari Castle in Ehime Prefecture. Right next to the ocean, I really liked this castle. Read more over at my blog: http://zoomingjapan.com/travel/imabari-castle/
Kakegawa Castle (Shizuoka) in spring: http://zoomingjapan.com/travel/kakegawa-castle/
Visiting Odawara Castle during a typhoon was certainly an "interesting" experience. Find out more in my newest blog post.
Japanese castles I've visited: #3 Ako Castle in Hyogo Prefecture. I've been there a few times, mostly in autumn. There's no main tower left and nothing to enter, but a few nice turrets and moat as well as castle walls.
Oshi Castle in Saitama Prefecture. A nice little castle with some beautiful surroundings.