"You're a masochist after all, sucking dick so obediently." Marina was employed at an IT equipment sales company in Tokyo and was promoted to manager. However, Marina's stress was reaching its limit due to excessive expectations at work, incompetent training by her subordinate Yoshino, and the cold treatment from her husband at home. However, Yoshino accidentally noticed the masochistic nature hidden deep in Marina's heart. Then, during his lunch break, Yoshino called Marina to an SM hotel and trained her as an obedient bitch who felt pleasure even in pain in an absolute master-slave relationship that reversed the roles at work...