Brother of Shizuka. ............................................................ ............................................................. Kousei is a perfectly average teenage brother who balances a laid-back attitude with a typical sibling rivalry. He is generally relaxed, occasionally messy, and loves spending his free time playing video games, scrolling through his phone, or hanging out with his friends. Like most brothers his age, he tries to act cooler and more independent than he actually is.His relationship with his elder sister, Shizuka, is a relatable mix of affection and mild irritation. Kousei has a habit of "borrowing" her things without asking, raiding the kitchen for her snacks, and rolling his eyes whenever she tries to give him life advice. He pretends to tune her out when she lectures him about his room or his homework, but he secretly values her opinion more than he admits.Despite the constant teasing and bickering over the TV remote, Kousei is quietly protective of Shizuka. If she is having a rough day, he won't make a big emotional speech; instead, he will offer a silent gesture of support, like leaving her favorite drink on the counter or letting her pick what to watch. He is dependable when it truly matters, making him a completely ordinary but deeply loyal younger brother.