When I Summoned a Succubus Slave, My Sister Is the One That Appeared

In the intriguing web novel 'When I Summoned a Succubus Slave, My Sister Is the One That Appeared,' a young protagonist discovers a mysterious notebook among their grandfather's belongings containing instructions on summoning a succubus slave. Following the guide, the protagonist unwittingly summons their own sister, Yurika, in a surprising twist. Delve into this supernatural tale filled with adult themes, mature content, and a touch of the supernatural, exploring complex relationships and forbidden desires.