It's japanese psychedelic jazz fusion based on a 1971 children's book of the same name by Count Ul Del Rico. I don't know what else to say it's just awesome, it has narration from the book that makes it a really fun listen and narrative with great musicianship. Parts of it are serene and calming interspersed with high energy bangers like Seven Goblins and Thunderstorm, it flows together really well without having a stale vibe.