FSDSS-517 The employee used a magic ring to brainwash his colleague into humiliating him

A few years ago, our good man Makoto was pranked and humiliated by a group of female students, causing him to be fired. Due to some twist of fate, in his new job, he coincidentally meets that female student (Nene Yoshitaka), because she is now a colleague. To anger him further, Nene prepares to marry the chairman's son. At that intersection, he sought revenge through brainwashing.