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

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

Among grandfather’s memento, I found an old notebook. It says『How to summon a succubus slave』&h.e.l.lip;Of course, I tried it, for some reason my little sister, Yurika appeared.