@badri there's many factors why it blew up. to name a few: good story, relatable main characters, amazing animation, catchy music and a mythology that's new for most people!

it released with very little promotion and got big through word of mouth.
i feel like most people were surprised hearing it, then watched it and started talking about it, because they didn't expect it to be that good ^^

@risa thanks for the explanation! I didn't expect it to be great either, but I'm going to add it to my watchlist now and hopefully be surprised like everyone else

@badri hope you'll enjoy it ^^