[ Warning: Mature content R-18 ] 22 years old man — Sieg found himself being summoned into the Fantasy World of Eirini by a beautiful, voluptuous woman (Valerie) to become her familiar. Familiar was considered a long-life partner and a guardian protector to a mage. No mage will go into a battlefield without their familiar fighting with them side-by-side. But somehow, due to some interruption by [Lust System]. His and Valerie's roles had been reversed, and she became his familiar instead of his master. Gaining a beautiful familiar on his first day in the new world wasn't something he had expected, but he really appreciated that. Join him in his journey to become the strongest mage and create a harem full of beauties along the way. ———————————————————————— -No Netorare -No Yaoi -No Yuri ————————————————————————