Nisan didn’t mean to fall in love with Nemutan. Their first encounter — at a comic-book convention that Nisan’s gaming friends dragged him to in Tokyo — was serendipitous. Nisan was wandering aimlessly around the crowded exhibition hall when he suddenly found himself staring into Nemutan’s bright blue eyes. In the beginning, they were just friends. Then, when Nisan got his driver’s license a few months later, he invited Nemutan for a ride around town in his beat-up Toyota. They went to a beach, not far from the home he shares with his parents in a suburb of Tokyo. It was the first of many road trips they would take together. As they got to know each other, they traveled hundreds of miles west — to Kyoto, Osaka and Nara, sleeping in his car or crashing on friends’ couches to save money. They took touristy pictures under cherry trees, frolicked like children on merry-go-rounds and slurped noodles on street corners. Now, after three years together, they are virtually inseparable. “I’ve experienced so many amazing things because of her,” Nisan told me, rubbing Nemutan’s leg warmly. “She has really changed my life.”