Sekai de Ichiban Ani Shiteru

Yori is an ordinary second-year high school student whose daily life takes an unexpected turn when her mother remarries. Suddenly, she finds herself connected to a new family, which includes her stepfather’s son, Seki, a second-year university student. Curious about her new stepbrother, Yori decides to visit his apartment, completely unprepared for the reality that awaits her behind the door. Instead of a typical college student, she is greeted by a half-naked, intimidating-looking young man who seems more frightening than welcoming. However, any apprehension Yori feels quickly dissolves into utter bewilderment. Without hesitation, this imposing figure begins showering her with relentless affection and doting attention, treating her as though she were the most precious person in his world. His behavior is overwhelmingly frivolous, entirely lacking boundaries, and far too clingy for comfort. Despite his eccentric and overbearing nature, Yori discovers something disarming about Seki's genuine warmth. She tries to maintain her composure around her bizarre new stepbrother, yet no matter how hard she attempts to keep her distance from his constant pampering, she finds it impossible to truly resent him. What begins as an awkward living arrangement slowly evolves into an unpredictable dynamic, leaving Yori caught between exasperation and an undeniable fondness for the strangest brother she could have ever imagined.