Riko transferred to a new school and struggled to adapt, leaving her isolated and lonely. At the suggestion of a teacher who took interest in her, she joined a swimming club training camp as a manager. The first person she met was someone kind yet strict, with an oddly seductive presence. His eyes stared intently at her, as if trying to read her very soul. Though intimidated by his gaze, she gradually began to open up. His influence on her grew deeper and stronger than she ever imagined, sending powerful waves that shook her heart to its core.