Narumi, portrayed by Nahana, is known for her fiery temperament, which led her to stab a coworker and subsequently serve a prison sentence. Upon completing her time behind bars, she returns to her childhood hometown. There, she seeks out her younger brother, Kei, played by Kuniaki Nakamura. Having lost their parents in a tragic accident when they were young, Kei remains Narumi’s sole source of support. Observing Kei’s content life with his girlfriend Kana, depicted by Keiko Sugawara, Narumi becomes determined to reclaim her brother’s attention. In doing so, she unveils a hidden secret shared between her and Kei.