Shino, 30 years old, is an experienced woman both professionally and emotionally. But today, it is marriage that worries her and she wishes to find a partner who, like her, aspires to settle down. Only Mayuki, a young man nine years younger than her, declares his love to her and enters her life without warning! How can she resist so much spontaneity and fervor? Shino then decides to have a casual relationship with him until she finds the one who will meet her selection criteria...