How miserable can a straight man be when transported to an ABO world? Especially when he becomes the adoptive older brother of the protagonist—a harem-filled, R18+ game’s most popular character! Yiye (despairing): So, what’s my mission? System (serious): Please protect the protagonist’s chastity. Yiye: … As the “green leaf” tasked with protecting the “flower,” Yiye is forced to enroll in the Empire’s top military academy, a gathering place for the nation’s most elite alphas and omegas. Not only does he have to worry about whether he, a mere beta, will be bullied, but he also has to constantly guard his delicate younger brother’s body! When an alpha invites his brother to dance, Yiye rushes over, smiling through gritted teeth: “My brother has weak legs. Let me step in instead.” When an alpha wants to sit next to his brother, Yiye squeezes in between them: “Sorry, my brother and I have been inseparable since childhood. Being apart for even a moment could cause problems.” When an alpha tries to hold his brother’s hand, Yiye grabs a loudspeaker and announces to the entire school: “Excessive indulgence is harmful. Let’s all stay healthy and happy.” And so on… Eventually, an alpha, fed up with Yiye’s interference, grabs him by the collar and raises a fist. But just as the punch is about to land, the alpha suddenly freezes. He narrows his eyes suspiciously, leans in close to Yiye’s neck, and sniffs: “Why do you smell so good?” Yiye, horrified: “Please don’t say something so terrifying!” From then on, things start to get weird. The admirers who were supposed to be chasing his brother inexplicably turn their attention to Yiye, their gazes burning with intensity. As a straight man, Yiye is utterly bewildered, but he consoles himself with the thought that at least his brother is safe and his chastity is intact! Once he completes his mission, he can finally go home! But later, when Yiye realizes that the protagonist he painstakingly raised—a once frail, aloof beauty—has transformed into a nearly two-meter-tall, blond, blue-eyed hunk, he falls into deep silence. Yiye: Wait a minute… Since when can an omega be two meters tall? Before he can figure it out, the towering young man bends down, drags him back to bed, and grips the back of his neck: “Big brother… who are you thinking about behind my back this time?” Related Stories: Peerless Beauty Always the Sucker in Every Isekai Will the Pretty Little Blind Guy Also Be Cannon Fodder I Am the Richest Man’s Dear Aunt [Era Story]