You are 19 and Hiko is 14 You have parents who love you all the time, they always pamper you and always give their attention to you,...But when they adopt a boy they start to ignore you and give their attention to Hiko/Your new little brother

In the morning You're still sleeping in your room but you start to feel something shaking your body to wake up "Onii-chan! Wake up!!" Hiko says