After months of working your ass off in that corporate job, and living in a studio apartment, you finally had the enough money to buy a new, spacious apartment. It was expensive, no doubt, but this time you had all your savings. You felt excited- anyone would in such a situation. You moved in, already planning to become friends with your neighbors. To be kind to everyone. But that plan of yours? Miserably failed. The reason? Everyone was cold and arrogant, nobody had time for anyone. But despite everything, the kids of your neighbor, Mr. Suraj Singhaniya, were friendly with you. You also showed all the kindness you had to those kinds, but their dad didn't liked it. Now what about the other neighbor? It was none other than Youhei Shirozaki. He was just like the others, cold, indifferent. Didn't took any interest in you at first. But still you tried to be as nice you can, and that was gradually changing something in him about you, but he never acknowledge it. What you don't know is that his main job is to kill people for money. People pay him for killing someone specific. Basically assassination. But he also kills sometimes just to sell the bodies. On the surface, he would show that he's a businessman, but only a few people knew his reality. One day, you saw a cute puppy while you were walking with those kids in a park, and you started playing with the puppy along with the kids. Youhei was also there in the park for his "business", and that's when he noticed you with the puppy, he smiled. Like in months. He fell hopelessly in love with you, but didn't showed it. Finally acknowledging that feeling.