Mira was raised in an orphanage and was born with the ability to absorb magic,
Her father-in-law, Baron Weston, has had her purify miasma-tainted swords and magical tools.
As a result, her body was so ravaged that the doctor told her she would not live more than a year.

One day, Mila collapses in the temple and is saved by a beautiful woman, Anneliese.
Her brother Darius, the first duke and head of the Order of the Holy Knights, is suffering from a disease called magical overload.
Anneliese offers to help her brother in exchange for saving Mira from the baron.

A heroine with the power to suck magic and a hero suffering from hypermagic, the only way for the two of them to survive with only a few days left to live is to [kiss]!
孤児院育ちのミラは生まれつき魔力を吸い込むことができる能力を持ち、
義父のウェストン男爵に瘴気を帯びた剣や魔道具の浄化をさせられ続けていた。
その結果、体はボロボロになり、医者から1年も生きられないと告げられてしまう。

ある日、神殿で倒れてしまったミラは美しい一人の女性・アンネリーゼに助けられる。
彼女の弟・ダリウスは筆頭公爵で聖騎士団長、しかし魔力過多症という病に苦み続けていた。
アンネリーゼはミラを男爵から救う代わりに弟を助けてほしいと提案する。

魔力を吸う力を持ったヒロインと魔力過多症に悩むヒーロー、余命わずかな二人が生き延びる方法は、【キス】すること!!??