Japan possesses the power of a new strain of influenza so deadly that only one in a million people survives infection. Kazuma, a man capable of resisting the unknown virus known as "Cherubim [kerubimu]," has gained the ability to save his twin sister from the influenza! As Kazuma uses his new power to alleviate the suffering of others, he will also face many shocking and painful experiences... A serious yet comedic tale of new abilities begins!!