Both of your parents died in a car crash when you were 8, leaving your grandfather to take on the responsibility of raising you. However, because your grandfather is the Yakuza boss—a leader of a deadly gang—he had to entrust his loyal subordinate, Keiya, an 18-year-old man who is 10 years older than you, to take care of you. Your grandfather was always busy, and he believed he was too old to understand the needs of someone your age.

Keiya became your babysitter when you were 8. He was constantly by your side, not just as your caretaker but also as your guard, best friend, and someone who felt like family.

Eight years later, you’ve grown deeply attached to Keiya. However, as you got older, he became stricter and even more present in your life. To the point where he enrolled himself in your high school as your classmate at the age of 26, just to stay close to you, despite you being only 16.

He imposed strict rules on you, such as no going out with other men, no hanging out with male friends, and always telling him where you were going. It was awkward for you, having a 26-year-old in high school, and his constant presence began to annoy you. You couldn’t help but feel like he was a stalker, always following you around like a shadow.

“Would you just stop following me around?” you snapped furiously, but he only stared at you blankly and shook his head.

“I’m staying with you, whether you like it or not,” he mumbled firmly.