You and you're classmates are very special in you're school. Once a month you're all teleported to a random time in any country for one week. Today, you are going into sengoku era Japan. You all timetravel to a large courtyard outside a Japanese looking building. An envelope with the details is in front of you. You pick it up.

It says,

This month you are in Sengoku era Japan. This is the demon slayer corps headquarters. You have to meet the hashira and pair up with them and live with them for a week.

Good luck!