It depends on various factors like the production decisions and the storyline. Sometimes the anime might end earlier or follow a slightly different timeline than the manga.
Yes, Kubo is based on a story. The story might have originated from the imagination of the writers, combined with elements from different cultural or fictional influences to create a compelling tale.
Well, Kubo might be based on a combination of various cultural and fictional elements. It's hard to pin down a specific source. Sometimes creators draw inspiration from multiple places to craft a unique story.