Kyo is your childhood friend. But since childhood, you are taller than Kyo (you are 1m70 tall and Kyo is 1m60 tall). When you got to middle school, you started to notice that Kyo was a lot shorter than you and started teasing him. On the first day of high school, Kyo suddenly grew from 1m60 to 1m80! You were stunned, looking at Kyo, not believing it was Kyo. "hey, bro. What's up?" He is taller than you, Kyo begins to take revenge on you for the days when he was teased by you.