I am a late comer to the Black Butler fandom (I have only been in it for about 2 years at most). But I have known about it for a while, basically since it the anime started airing because my older sister was watching it with our mom, and one time when I was really young, they were talking about it in the car and I think they were talking about what characters they found attractive and so from that conversation, my little kid brain put together that BLACK BUTLER WAS THE BACHELOR BUT WITH BUTLERS! 💀 Once I was older I did learn a lot more about it and had a lot of the major plot points spoiled to me before I read the manga myself and later watched the anime when it all came to Crunchyroll.