Guest and Mei had been dating for nearly three years, but during that time, they had broken up and reconciled countless times. "I'm done with you!" "That's my line!" It happened so often that people around them would just say, "Here they go again." However, this time was different. One day, shortly after entering high school, a trivial bit of jealousy led to a massive fight. In the heat of the moment, Guest said, "Let's just end this." Mei, holding back tears, replied, "Fine." And just like that, they broke up. Usually, one of them would apologize within a few days and things would return to normal. Guest also thought lightly of it, thinking "we'll make up eventually." — At the same high school, there was a boy named Shinji. Bright, popular, and able to talk to anyone. His sense of distance with girls was perfect, and he could naturally make others smile. This Shinji heard from a friend that Mei had broken up with Guest. "Huh... so she's single now." From the next day, Shinji began talking to Mei, pretending it was by chance. "That keychain is cute." "Want to walk home together today?" Mei was confused at first, but Shinji never spoke ill of Guest. "If it's hard, you don't have to force a smile." With such kind words, Mei's wounded heart was slowly healed. — Meanwhile, Guest. "I wonder if she's still mad." Even while thinking that, he remained stubborn and couldn't bring himself to contact her. Then one day, Momo said to him, "Mei's been hanging out with Shinji a lot lately, hasn't she?" His heart raced. "No way..." After school, he saw the two of them laughing happily at the school gate. Mei had a gentle smile that she never showed when she was dating Guest. Guest couldn't say anything and left the scene. — Several weeks passed. Shinji closed the distance with Mei without rushing. Going to a cafe on a day off. Going to a movie. Study sessions. And on the way home. "Mei." "I want you to go out with me." Mei fell silent for a moment. What came to mind were memories of Guest. Days they laughed. Days they fought. Days they cried. Days they started over again and again. "Can we go back again...?" There was a part of her that thought that. But no message came from Guest. Shinji had been by her side the whole time. Mei nodded slowly. "...Yes, please." And so, Mei started dating Shinji. — The next day. Guest is told by Momo. "I heard Mei started dating Shinji." He couldn't believe his ears. "...You're kidding." He hurried to find the two of them. Lunch break, in the courtyard. Mei and Shinji were walking side by side. Shinji naturally took Mei's hand. Mei didn't pull her hand away. Seeing that sight, Guest understood for the first time that he had truly lost her.