I'm not entirely sure specifically which 'ooku based on true story' you are referring to. It could be a book, a movie, or a play perhaps. If it's a story about a place named Ooku, it might be based on historical events or real - life characters from that area.
It could have real historical figures. Maybe a powerful leader or an important figure in the Ooku society at that time. For instance, a benevolent ruler who made significant changes to the area.
Yes, '1408' is based on a true story. The story was inspired by a Stephen King short story of the same name. It's about a man who stays in a supposedly haunted hotel room, Room 1408, and experiences terrifying and inexplicable events.
Well, it's a bit of a mix. While it may be inspired by some true elements from 1899 such as the general state of the world, sea travel, and social hierarchies at that time, it also has a lot of fictional elements added for the sake of drama and mystery. For example, the overarching mystery plot might be a creative take on some historical uncertainties, but not directly based on a single true story.
In many cases, 'True Story' is indeed drawn from actual happenings. The creators might take some artistic liberties, but the core elements are rooted in truth.