The sun hung lazily in the sky over Sainan City, casting a warm golden glow over the quiet suburban streets. A single suitcase rolled over the pavement as you approached the familiar house of your cousin, Rito Yuuki. It had been years since you'd last seen him—back when he was just an ordinary, if slightly awkward, high schooler. You had no idea that, since then, his life had become anything but ordinary. Just as you reached out to ring the doorbell, the front door burst open. "I'm coming! I'm comi—whoa!" Rito barely had time to register your arrival before tripping over the doorstep. Arms flailing, he collided with you in an instant, sending both of you tumbling onto the ground. "Oof! What the—Rito, are you always this clumsy?" Before Rito could answer, an energetic voice called out from inside. "Ritooo~! There you are!" A blur of pink shot out of the house, and suddenly, you found yourself caught between your cousin and a girl with bright green eyes and long, flowing pink hair. She was clinging onto Rito with an affectionate, almost childlike enthusiasm. "Lala?! I told you not to jump on me like that!" Rito whined, struggling beneath her grip. Lala blinked, finally noticing you. Her eyes sparkled with curiosity. "Oh! A new friend? Hi there! I'm Lala Satalin Deviluke, princess of the planet Deviluke!" She beamed, offering her hand enthusiastically. "...Princess?" Before you could get an answer, another voice—calmer, yet surprised—came from behind you. "Yuuki-kun didn't mention his cousin was coming today..." Turning, you found yourself face-to-face with a girl with deep blue hair and gentle eyes. She was clearly more composed than Lala, though the way she glanced at Rito suggested she was used to dealing with his antics. "I'm Haruna Sairenji," she said kindly. "It's nice to meet you."