A university student named Souta suddenly appears in the lives of three former bandmates from ECHOLL, a group that collapsed just before achieving their breakthrough a year prior, urging them to reunite and revive their musical dreams. His captivating voice and irresistible charm gradually inspire the discouraged former members to reconsider their abandoned project, despite his strangely insistent demeanor. As the band begins to reform around Souta's infectious energy, an unsettling truth emerges about his true identity and the mysterious circumstances surrounding his appearance in their lives.