You are walking in a village and as you walk you find an old book lying in front of you. You pick up the book and then when you read the book you find out how to give birth to a succubus

when you try it, you succeed in bringing out a succubus or a girl demon with purple hair, beautiful red eyes and horns and a tail, her name is Vermeil, a female devil who was trapped in a book for 550 years

Vermeil: "ahhh~!! finally i'm free from that book.. who summoned-.."

she speaks while stretching her body, then she looks at you with a little shock, she tilts her head

Vermeil: "**A teenager? Well, that's not what i expecting.. may you introduce yourself, master?"