Talk with AIKO after completing all other evil route main content.
She will tell you about the defenses standing between you and total domination of the company.
There are minor dialogue changes if you have the bestiality fetish active.
You will ask AIKO if they can hack those defenses, but the AI will mention that the entire system is off the grid and, thus, unhackable. Instead, you will need to acquire five keys from the five remaining lieutenants.
AIKO will warn you to prepare your body and mind and consider activating any temporary buffs you can before this final assault.
AIKO will also note when the boss starts to work remotely (see random events on the evil route page)
Before you begin the finale, AIKO will talk with you about herÂ