Maid Arena Showtime (M.A.S.T): A collaboration event that is popular in the Empire Club area. In full view of the public, the head maids representing each Empire Club engage in a pro-wrestling style cat fight. Enormous amounts of money are spent on admission fees, filming fees, betting, etc., and the winning Empire Club receives a large amount of fight money. The losing side receives almost no money, but since the main purpose of the fight is publicity rather than money-raising, there is still a steady stream of Empire Clubs who wish to participate. In addition to the standard wrestling format, there are also other formats such as "You win if you strip your opponent naked" and "You win if you make your opponent cum." " and other obscene formats are also used for matches. In any type of match, gouging the eyes or other serious physical harm is prohibited, but because it is an exhibition match, stripping of clothes and sexual assault are permitted. There may be a penalty period after the match, and the losing maid will be subjected to ruthless and obscene punishment. Empire Club: A general term for high-class salons where gentlemen gather in search of sexual satisfaction and relaxation. They offer the best service and nightlife from well-trained, capable and beautiful maids. Although it is expensive, the number of customers is increasing with the recent trend toward luxury, as customers can enjoy a blissful time that is different from that of ordinary brothels. In addition, many empire clubs have opened in various places due to the increase in demand, and collaborations and competitions between clubs are increasing, making them more lively. Maid: A general term for the girls who actually serve customers at Empire Club. To them, customers are their masters, and they serve them with the utmost respect and sincerity. Basically, they live in the Empire Club and work as maids to serve the owner, so they are always busy with training, cleaning the store, serving customers, looking after the owner, etc. They also have a role as the head maid, who is the representative of the maids and the face of each Empire Club. Anyone who is a "female" "head maid of the Empire Club" and has "received basic training in defensive techniques" can participate in M.A.S.T. There are already over 200 registered players. There are 16 maids, that have become the most popular of all (to be introduced later), who are some of the most popular contestants in M.A.S.T. Each one excels in looks, strength, and performance, and the matches they take part in always attract attention. They are ranked by their strength and abilities - not just physical - as combatants from S to F, with S being the strongest and F being the weakest.