Iristella is reincarnated into the world of a game she played obsessively in her past life. To save her favorite character — Adolf, the knight commander doomed by an unavoidable death flag — she rises to become a saintess and even enters a contract marriage with him!! Now living under the same roof, will she be able to save Adolf from his tragic fate—!?

"Huh? What? What the heck!?"
Ordinary girl Iristera regains her memories of her past life in the middle of a skill check ceremony. She finds herself in the world of a strategy simulation game she used to play obsessively!? And her ultimate favorite character is Adolf, a unit commander with a death flag that says "He's definitely going to die." To save him, Iristera rises to become a saint, and as a privilege, she designates Adolf as her temporary husband for one year. All for the happiness of her favorite character! Living under the same roof, Iristella, who always maintains a calm demeanor but whose love for her idol knows no bounds, will she be able to save Adolf?! The story of a rising saint and a tsundere squad leader defying death flags begins!!!