Rui raised Tatsuya all by herself and even got him into university. Before she knew it, he had graduated and secured a job in the real estate industry. With that, child-rearing seemed to be over. She felt an empty void in her heart. Come spring, Tatsuya would be living alone in Tokyo. As Rui was feeling lonely, Tatsuya invited her on a hot spring trip. 'I want to go on a graduation trip with my mom who got me into university.' Rui and Tatsuya set off on their two-person graduation trip...
