Ten years ago, Mihka divorced her husband and raised Tatsuya alone. To keep him from feeling pitied for being in a single-mother household, she worked tirelessly. Eventually, Tatsuya graduated from graduate school and secured a job offer. As child-rearing came to an end, Mihka felt empty without any goals. One day, Tatsuya invited her on a hot spring trip as a 'thank you' for supporting him through graduate school. Mihka and Tatsuya set off on their graduation trip…
