Demon Slayer is one of the most popular shonen series right now, and it's easy to see why this is the case. The combination of excellent storytelling in the manga coupled with the anime's stellar animation has helped Demon Slayer become the hottest shonen property around, and fans can't seem to get enough of it. The fact that Demon Slayer: Mugen Train became the highest-grossing movie ever released in Japan is a testament to how much of a massive phenomenon this series is, and one can only imagine the records that Infinity Castle will break when this trilogy comes out in theaters.