Once In a Blue Moon

"The moonlight calls to those who wander-and to those still waiting to be found again."

High schooler Mizuki Riko lives a bright and cheerful life-until a school trip to a forgotten shrine unearths a haunting sense of nostalgia. That night, everything changes. Strange dreams, flashes of another time, and an aching in her heart that refuses to fade.

But she's not the only one who feels it.

As her reality begins to blur with someone else's, the lines between past and present start to fade.

Across the classroom sits Nishimura Katsuo-quiet, distant, and often invisible to those around him. But when Riko begins to change, he feels it too. Like two ends of the same string.

Memories that aren't his, emotions he can't explain, and a pull toward the very girl who once saved him, and is destined to save him in every lifetime.

Will fate be kinder to them this time?

Because some promises are too deep to fade,
some hearts never truly forget-
and some souls only find their way back
once in a blue moon.