【KAMINENDOCORP】I’m sorry to say that the Book of Discoveries 6 has disappeared.

The sixth entry in the Book of Secrets series, set in a time period before Book of Secrets 1.
The story is about an angel and a human half-breed brother and sister who try to kill a bad succubus, but?

There are no reversals, such as a female character losing her cock and turning into a pale face.

Stomping from defeat
Energy Drain
Level Drain
Cowgirl to close face-to-face ejaculation while being hugged from front to back
Manipulated and forced mating
Tentacles in the vagina enter through the urethra and squeeze directly from the seminal vesicles
etc…
There is the familiar [HP/MP energy gauge display that further visualizes the feeling of being squeezed during mating] in the Book of Adventure series.

In the past, humans were threatened by the wonders of the Demon King.

In the midst of these unfortunate times, an angel and a human descended to the earth, fell in love, and had two children, whom they named [Lucielil] and [Emielil].
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In the event that you are not aware of the human’s intentions, the two of them were loved by their parents and spent a happy childhood.

But the demon king did not overlook them.
The hidden village is destroyed by a subordinate witch succubus.

Time passes, and the Demon King is defeated by the brave Will and his men.

In order to defeat the avenging Witch Succubus, the two surviving companions wandered from place to place, earning their living as bounty hunters slaying demons. And then they encounter each other in a city that was destroyed by slime.