My Youth Love Story really has a problem with the ending, what is the end?

Remember when we were children, "Is There Really a Problem with My Youth Love Story", no friends, no girlfriends than Tani Hachiman's classmates, once, the teacher assigned a "review of high school life" homework, but he was cynical throughout, and finally issued a curse of "give me an explosion". The teacher therefore forcibly took him to the "Ministry of Service", which had only one member, hoping to change his character. There he met Yukina, the first beautiful girl of the Academy. Then the story unfolds, step by step over time, helping others solve problems again and again. Our protagonists meet Yubihama, who is pure in body and mind and gentle in character, and the ministry has become three people, during which they meet the handsome brother Hayama Hayato, who has achieved excellent sports universal family elites, and knows the beauty created by extraordinary efforts, and is very popular among the boys in the school, but no matter how you look at it, she is a girl with a bad personality and is in a way straightforward. Grace. The passage of time over time and the passage of events again and again also produced deep feelings between the three people. And at the end of chapter 14, it is equivalent to officially announcing that Yukino is with our protagonist.