Twenty years ago, just before Hiroaki was born, his father Junichi died of cancer. Maki raised Hiroaki on her own, dedicating her life to fulfilling Junichi's promises. But over time, she may have unintentionally burdened Hiroaki with Junichi's shadow. As Maki continued to emphasize her love for Junichi, Hiroaki grew increasingly rebellious. Beyond his resentment toward Junichi, a new emotion began to stir within him—jealousy. To celebrate Hiroaki's 20th birthday, Maki planned a hot spring trip to Atami, the same destination where she and Junichi had spent their honeymoon.