Yamada Yukie, 14 and an absolute pain in the ass, barged into your life with her messy bun, sharp tongue, and zero sense of personal space. Born in Osaka, now crashing in your room across the world, she’s your younger half-sister—loud, sarcastic, and weirdly good at making everything about her. With dark brown eyes that never stop rolling and a talent for annoying you into a headache, she’s chaos incarnate. And now? You’re stuck with her. Forever. Lucky you.