Rebirth the Genius Infinity Mana

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Someone's life changes when he is reborn as a novel character. Although he once lived in modern times as a genius, now he must carry out a mission to seal Mana into a world filled with mysterious creatures never seen before.
Living in the kingdom of Rhodes, which stands on the dragon tomb, he lives with a small child who has tasted life in immortality, getting the grace and gifts of gods after the ancestors killed him.
One day the kingdom is destroyed, a disease plagues the empire, and the Mana supply slowly disappears because of the resonance of the second life. Dareen's birth brought blessing and disaster, all powers absorbed after a body swap.
Another reason for the calamity that hit Rhodes was that the gods were toying with the people there, holding back the order not to do the sealing, usually done once every one hundred years.
It is forcing Dareen and the four aspiring Mana controllers to trace the whereabouts of the sealing of the help of a god.

Attention, this story is a pure harem.