YumiSakamakiyumi
> "Saecula saeculorum, be my friend."
A whisper from the forgotten past. A pact that never dies.
When Seri Mikasaki, a quiet 17-year-old girl with a mysterious past, transfers to a new school, she discovers an ancient incantation hidden in a dusty mirror: "Saecula saeculorum, be my friend." Speaking the words awakens Kalen, a timeless spirit bound by an eternal contract - once made in love, now buried in memory.
As Seri's bond with Kalen deepens, she becomes entangled in a forgotten war between dimensions, where magic, memory, and time itself bend and break. Hunted by unseen forces, watched closely by the cold and enigmatic Sora, and protected by her loyal (if chaotic) friend Ayumi, Seri must uncover the truth behind the pact - and the lives it's already claimed.
But the closer she comes to awakening her power, the more dangerous her reality becomes. Because once the pact is complete... Kalen may vanish from her world forever.