The phrase " Succubus Yondara Haha ga Kita!? " (translating to " I Summoned a Succubus and My Mother Appeared!?

At last, they reached the Heart of the World—a cavern of towering crystal columns that sang with an ethereal hum. In its center pulsed the Luminous Core, a sphere of pure, white light, beating like a heart.

Mira stepped forward, reciting ancient verses that resonated with the Core’s frequency. The Core responded, expanding and drawing in the surrounding energy. Yondara, understanding the ritual, placed her hands upon the sphere. Her own essence—her night‑born energy—began to merge with the Core.