ester's manga / #silly couple(3)

(Romantic Comedy) Section Chief Mizuguchi is a fussy man. His coworkers don't dislike him but, they can see why no one has wanted to marry him yet. However it seems someone is interested in Mizuguchi and this person is writing and leaving sexually threatening notes in his desk?? Mizuguchi noticed the security guard Tsujita suspiciously around his desk could he be the one leaving the notes??