"I love you, Mira," Darius-sama said, kissing him as usual. Our contract marriage was supposed to be for two years, and it was supposed to be a loveless relationship!?

Mira, who grew up in an orphanage, was born with the ability to absorb magical power, and her stepfather, Baron Weston, kept forcing her to purify her swords and magical tools, which were tainted with miasma. As a result, her body falls apart and doctors tell her she won't live for a year.

One day, Mira collapses in the temple and is rescued by a beautiful woman, Anneliese. Her younger brother, Darius, is the first duke and commander of the Holy Knights, but he continues to suffer from a disease called hypermagic disorder. She suggests that Anneliese help her brother in exchange for saving Mila from her baron.

The heroine who has the power to absorb magical energy and the hero who suffers from excessive magical energy, the only way for these two to survive is to Kiss!!??