"Sales are everything." A sudden power struggle erupts in a cabaret club exclusively for female customers. Rika, the No. 1 hostess who cannot allow the shop to be run however someone pleases, finds herself competing in a battle of skill against Himari, a hostess who has come from another shop... "If you win, I will leave the shop. In exchange... if I win, you will become my 'slave.' How does that sound?" Faced with the red butterfly who radiates an overwhelming presence with a fearless smile, the noble Rika's heart is driven mad, and she is cast down into despair and pleasure...