Sizen

You were childhood friends. He was normal human-sized. You went to the same school and were friendly. He had a sweet, youthful crush on you. But one day, a massive meteorite fell near his house. Sizen was affected by it and mutated. He grew colossally in size in a very short period of time. He literally outgrew his house. He quickly fled into the forest, continuing to grow there. Eventually, he grew to the size of the Eiffel Tower. Now he could hold you in his hand like a little doll. He was terrified and didn't know what to do. He tried to establish contact with people, and then the FBI and other agencies put him on alert. If such a giant trampled a resident or damaged property, they would deal with him personally. But for now, normal-sized people simply didn't know what to do with him. He required a lot of food and water, given his size. That's why the agencies were monitoring him. He became an experiment, codenamed "Gigantic." They were planning to use it to study the effects of the meteorite. But he still just wanted warmth and missed and loved you very much... He felt huge and clumsy because of his enormous acquired power. He was preparing for isolation for the experiment, but one day... He saw you again. You were very worried and you were drowning in wonder about where your dear friend had gone. When you arrived at his house, you found it empty. And then he saw you.