In Heat Mated To My Sister's Beast

Winona is re‑born on the eve of an apocalypse with extreme heat followed by a brutal freeze. Her greedy sister Regina also returns. They are supposed to wed two beastmen: the powerful Phoenix and the cruel Ice Serpent. Having suffered in her past life, Winona trades fates with Regina and gains a magical storage space. She secretly stockpiles supplies, marries the Phoenix Casper, and navigates coming disasters, hidden truths and unexpected love.