"Welcome to the Pet Shop"

Nagasu, a company employee, was put as the head of a newly assigned department and received sexual harassment on the first day he worked there. Because he was in debt, he cannot afford to quit, and had to endure it every day. One day, as he flees from the pervert director, he came across the unfamiliar Pet shop. Out of curiosity, Nagasu entered the shop and found something unusual. Who is the man claimed to be the owner's pet shop? What is the "pet" he’s selling there?