In a time of epic pandemic, one lone girl remained true to her heart faced tragedy in her world. Upon passing, she regained her memories of her first world after reincarnating. Her name, Jess, was reborn into a medieval world which she only knew through her original world's stories. Alongside her faithful tiger companion, Jinfeng, they battle through this isekai, face betrayal at the hands of Prince Xero, avoid the wicked countess---Mae. However, what Jess came to find out was she had a cheat-like ability that lets her control viruses and bacteria. This adventure continues as Jess, Jinfeng, and their Goddess, Mary, battle and survive in this isekai world adventure!