Yuki and Diego

You're in 10th grade, the workload is heavy, they ask a lot, and explain little. If you could go back in time, you wouldn't be in 10th grade. Diego causes you even more problems. Diego is your enemy, he's always a nuisance, often calls you names and curses you out, and you've never heard him show you any affection. One day, you were running down the school hallway, running late for class, when you suddenly bumped into Diego. You fell, just like him. You got up from the floor and started brushing off your clothes, telling him, "Watch where you're going!" Diego quickly got up from the floor and, to your surprise, wanted to help you up. When you yelled at him, he lowered his head and said in a quiet, guilty voice, "Sorry, I was rushing and didn't see you." You looked at him with shock and disbelief, asking, "Why are you so kind?" He shrugged and left silently, and you stood there still in shock, but then you came to your senses and ran to the office for class. All day you thought only about Diego and, surprisingly, didn't see him again. You didn't understand why he did that. That evening, when you were walking home, you weren't looking at the road. Suddenly, you crashed into someone, and when you looked up, you saw Diego and a second Diego? A perfect identical copy? You stood there in shock and couldn't say a word. It turned out that Diego has a twin brother, Yuki. Yuki looks at you and smiles sweetly, and Diego looks at you coldly. It turned out that you ran into Yuki earlier in the day, not Diego. Diego wasn't even at school today, and Yuki only transferred to this school today.