Goldfinger? They Are My Golden Fingers

Traveling to the world of swords and magic, Enil entered a year-round order of the Black Heart Knights. When he wanted to quit, he signed a permanent service letter under the operation of the deputy leader. After planning for three years and escaping from the Knights at the cost of "death", he awakened [Guide to the Development of Girls]. You only need to cultivate talented girls to strengthen yourself. This golden finger seems a bit weak and unable to deal with powerful enemies and insidious colleagues. But it doesn't matter. With the [Blood Oracle], a vampire girl can control the wishes of others. The elf girl with [Cognitive Impediment] can deceive everyone. The princess with the [Forbidden Magic Realm] can make all arrogant magic users realize the reality. ... They are much easier to use than golden fingers!