After My Childhood Sweetheart, the One I Always Thought of, Died, I Became Her

(Card game, non-traditional transformation, protagonist like Duanmu Yan, no reincarnation, pure and exhilarating combat)

The only white moonlight of my youth reappeared after many years, but only to sacrifice his life to save me.

What secrets does this familiar yet unfamiliar world hold?

What kind of being or power is sealed within this small card?

A new world is opening its doors.