Himitsu No Aizu
秘密の合図
Mizumori and Nishijima are both lecturers at a cram school, maintaining a secret relationship behind the professional facade of their workplace. Their private signal is a simple cell phone strap: when Nishijima changes it, it means the invitation "How about today?"
Despite his efforts to keep business and pleasure separate, the line between their professional lives and physical relationship begins to blur. The tension escalates as the secret signal becomes a dangerous game of unspoken intentions and provocative adult desires.
