After finishing his night shift, Makoto returned to his apartment. As usual, he went upstairs to go home, only to find a couple had moved in next door. They seemed to have started arguing during the move, and the argument was quite loud. Makoto was a little bothered, but felt that neighbors should help each other, so he didn't think much of it. However, when he went next door to say hello, he discovered it was his ex-girlfriend, Haruka. The two were suddenly reunited and speechless for a moment. From that day on, Makoto frequently encountered Haruka on his way home from his night shift, seeing her husband off to work…