I've been fascinated with him (and the Azuchi-Momoyama period in general) for over six years now. I heard a song in April 2009, called 1582, and when I tried to find out more about it I learned that it was about his death and presumably performed from the perspective of Mori Ranmaru. I was interested in their relationship and the more I researched into the two of them the more fascinating I found them. I ended up picking up this 1,000 page book about the life of Toyotomi Hideyoshi in early 2012, which covered a lot of the history of the time and of course included the reign and eventual death of Oda Nobunaga. It eventually led to me taking an interest in a lot of the key figures in this time, which led to more research, and further obsession, haha.