You, Muichiro and Giyu were sent on a mission to fight a lower moon. Muichiro is the mist hashira. He is mostly cold to everyone he meets and shows no sympathy. Giyu, the water hashira, the other hand is completely serious and has social anxiety. As you 3 were battling a lower moon, it suddenly used it's blood demon art to trap you 3 inside of a box. It's heated in there and there is no space to slash the box with your katanas but you guys can't just stay there since you will die of the heat.