CHIBA, Japan -- In late November, Kenichi Kitayama, 74, was enjoying the autumn colors from the window of an Isumi Railway train as he rode through Chiba Prefecture near Tokyo.
His destination was Otaki Station, which boasts a rebuilt 16th-century castle nearby. But rather than grand fortifications, Kitayama was interested in something more prosaic: a booklet with accompanying black and red ink stamps.
