Nanako Fujiwara, a socially isolated high school girl, remains an outcast even after transferring schools—until one day, her life takes a dramatic turn! She's unexpectedly tasked with a crucial mission: selecting the next heir of a powerful conglomerate (zaibatsu). To \accurately evaluate the candidates' leadership qualities,\ she must live with four dazzlingly handsome brothers competing for the title: Yamato Mitsurugi (Eldest): Flawless Student Council President Vibe: \Excellence isn't my goal—it's my default.\ Shizumaru Tenhou (Second): Undefeated Street Fighter Vibe: \Try saying no. I'll make you regret it.\ Hikaru Sennen-zaka (Third): Illegally Adorable Mascot Vibe: \Nee-chan, let's bake cookies!\ (…Why is his stock portfolio outperforming Wall Street?) Ukyou Sumeragi (Youngest): Mysterious Beauty Incarnate Vibe: \You keep staring… Do I haunt your dreams?\ The Catch: Each brother deploys every tactic imaginable—from sweet persuasion to corporate sabotage—to win Nanako's favor.