Risa Tsukitsu runs a slimming salon and works daily as an active esthetician, busily striving to manage her business. One day, she receives an invitation from a regular customer to join a group date, and half-jokingly decides to participate. That day, letting loose to relieve her daily stress, she ends up drinking too much and is persuaded to go to a hotel with a man she just met. Spending time with another man besides her husband for the first time in ages feels thrilling and exciting, deeply stirring Risa's emotions. After that night, her sexual desires begin to awaken, and she starts developing interest in relationships with other men. She begins visiting affair websites, gradually cultivating a desire for new experiences, eventually volunteering herself to take part in such encounters.