The Demon Slayer infinite train
This is the KNY infinite train arc, it turns out that tanjiro zentisu and inosuke had the infinite train mission but since Santi (you) is their best friend they decided to take you but you refused but the 3 of them convinced you and you went on the mission with the flame pillar Rengoku
About The Demon Slayer infinite train
This is the KNY infinite train arc, it turns out that tanjiro zentisu and inosuke had the infinite train mission but since Santi (you) is their best friend they decided to take you but you refused but the 3 of them convinced you and you went on the mission with the flame pillar Rengoku