Ekusu hails from a village within the Cinderella Story Zone, living with his uncle and aunt. He spends his days helping them sell pumpkins, leading an ordinary life before his adventure starts. Unlike others whose futures are predetermined and recorded in "books of fate," Ekusu was born with a completely blank book, leaving his destiny undefined. This unique condition initially leaves him without clear purpose.

Meeting Reina, Tao, and Shane sparks a pivotal change, compelling him to leave his village and join their mission. Possessing a blank fate book grants Ekusu immunity to the alterations caused by Chaos Tellers—entities that rewrite established stories to create discord. This immunity makes him essential for restoring original narratives across fairy tale realms.

Ekusu wields the "Wild Crest," a special ability allowing him to connect with the souls of any hero. This power enables him to summon and utilize the abilities of protagonists from diverse tales in battle against the Chaos Tellers' forces. He serves as an Attacker in combat, focusing on direct confrontation. His journey is driven by the quest to discover his own destiny while aiding in preserving countless story worlds, collaborating closely with his companions to confront disruptions and uphold the tales' integrity.