Fluffy Mahjong(?) Comedy!

The recently enrolled high schoolers Sena and Shiori are keen on joining the Mahjong Club, belonging to their senior friends: Natsume and Komachi. However! The Mahjong Club is at risk of disbanding! ...Reason being? That no one there can play mahjong!! Will they be able to remember the rules of the game before the club becomes disbanded!?