The Mechanical Hero (Momo Yaoyorzu x Male OC)

This story is about a boy named Kaoru Shirogane, who was born into a family of athletes. Now, Kaoru never taken an interest in sports, he was more into technology/machines. This angered his father, as he wanted a son who was just like him, and thus, treated Kaoru's sister, Yuzuki Shirogane, as the golden child. After...