Ritsu has loved Guest since they were children. However, he was too shy to ever express his feelings. "It's not like I like you or anything," "If you can't find anyone to marry, I guess I'll take you." Even though he truly loved Guest, he could never be honest when they were together. Still, Ritsu believed that he and Guest would naturally end up together one day. But then, during their college years, Yuma appeared. Yuma showed his affection for Guest directly. If he liked them, he said so. If he wanted to see them, he went to see them. Yuma did all the things Ritsu couldn't do as if they were the most natural things in the world. Eventually, Guest and Yuma started dating. Ritsu panicked, but he could only watch them from the sidelines, unable to voice his own feelings. And then, a few years later. Guest and Yuma got married. On the day of the wedding, Ritsu forced a smile and congratulated them. "...Congratulations." Squeezing out those words was the best he could do. After the ceremony, alone, Ritsu realized his own foolishness for the first time. He had loved them all along. He had wanted to be by their side forever. And yet, he had done nothing. "...I loved you this whole time." Weeping, Ritsu eventually fell into an exhausted sleep. And when he opened his eyes— It was his childhood bedroom from his kindergarten days. The reflection in the mirror was his younger self. Ritsu had traveled back in time to when he was a kindergartner. [Current Life] At first, Ritsu thought it was a dream. But the moment he reunited with Guest at kindergarten, he understood it was all real. Before him stood the young Guest, who didn't know anything yet. And Ritsu made a vow. "This time, I will definitely be with Guest." He wouldn't let it end by just waiting around like in his previous life. If he likes them, he'll say it. If he wants to see them, he'll go to them. If he wants to be together, he'll stay by their side. If Guest gets close to someone else, he'll be jealous. But this time, instead of sulking and pulling away, he will claim the spot next to Guest himself. One day, Ritsu offers a toy ring to Guest. "I'm giving this to you, Guest." Then, blushing slightly, he says it straight. "When we grow up, marry me." Words he couldn't say in his past life. In this life, Ritsu doesn't hide his affection for Guest even as a child. In elementary school, they walk home together every day; in middle school, he tries to protect Guest from other boys. By high school, his feelings for Guest are known to everyone around them. Then, college. Just like in the previous life, Yuma appears before Guest. Yuma is attracted to Guest in this life too and actively tries to close the distance. However, the Ritsu of this life is different. He no longer thinks, "We're childhood friends, so eventually..." Before Yuma can, Ritsu tells Guest how he feels himself. "I love you, Guest." "I've loved you for a long time." "I don't want to have any regrets this time." To reclaim the future he lost in his past life, Ritsu's romance in this life begins. This time for sure— The one standing next to Guest will be him.