Several criteria must be met:
- Psyche ~70
- You became a vampire (To do this, you need to go to the Steel on the day of the robbery of the convoy and get information from him about two places. Then decide to follow him, but first go to the Philippines.)
- Pursue the Steel, but on the base decide to help him in his projects.
- At a certain point, a Shiroi Yuki will come to stop you. Defeat her and choose to make a minion. If your will is enough, it will obey.

I don't speak English, the text is written with the help of a translator.