P.S. 2 ~Shinjitsu no Tobira~

Five years after events of the prequel Hiroyuki is teaching at the college while also serving as administrator of the homepage "The Net" that recruits sex slave volunteers to give them humiliating orders by the internet. One day he receives an email coming from the woman who created the old P.S. website inviting him to administer a new P.S.2 website. The story starts from here.

[From vndbreview]