Akariko (25), a married woman, feels exhausted in her relationship and increasingly lonely. With her husband working late every night, their time together is scarce. Though he should be the closest person to her, he now feels the furthest away. Tired of his brief calls and messages during work breaks, and clinging only to their monthly dinner outings, she has pushed herself to the limit. Desperate to forget her loneliness, she begins seeking the warmth of another man. As she surrenders herself to his embrace, Akariko trembles—body and soul—like soaking in a hot spring. A married woman's heart and body shaken by the warmth of the waters and the stirrings of love—her journey into a full hot spring escape unfolds.