Enjyu is a prominent figure in the Battle B-Daman narrative, initially defined by a complex and troubled past. A talented player, he was forced by his father to deliberately lose matches in exchange for money for their rent, making opponents appear skilled while casting himself as an amateur. His frustration peaked during the Junior B-Daman Tournament, resulting in disqualification after a false cheating accusation when he refused to continue the charade. Betrayed by his friend Cornell, Enjyu confronted his father in a B-DaBattle. This confrontation triggered a dramatic shift: his personality altered and his hair color changed from medium blue to deep red. This event led him to join the Shadow Alliance, where he received the B-Daman Lightning Kahn, noted as superior to and a twin of Yamato's Cobalt Blade.

Within the Shadow Alliance, Enjyu adopted a cold, power-focused personality, valuing strength above all and often operating alone. He occasionally displayed sadistic tendencies, exemplified by striking down Liena. His formidable skills were evident when he completed Armada's "Statue" test alone in less than half the time of others. In the IBA Winners Tournament, he easily defeated Berkhart in the semi-finals and later tortured Wen Yong Fa during their match. His B-Daman was upgraded to Blazing Kahn by Marda B using dark magic. His intense finals battle against Yamato spanned multiple rounds. During this clash, Enjyu revealed his hatred for happiness and fair play, stemming from his past. Ultimately defying Ababa's commands to battle fairly, he prompted Ababa to attempt his destruction. Yamato saved him, and after a grueling 40-round match, Enjyu was defeated. This loss resulted in a change of heart, leading to sportsmanship and friendship with Yamato and others.

Seeking redemption, Enjyu aimed to stop Marda B. He allowed Neo Shadow Alliance soldiers to capture him to infiltrate Marda B's hideout. In Tsubakura City, he pretended allegiance to the Neo Shadow Alliance, defeating Terry McScotty and destroying his Wing Ninja B-Daman. Revealing his true mission to Li—to destroy Marda B from within—he stole Marda B's B-Energy. Marda Biarce eventually confronted and defeated him, leading to his brainwashing. Under this control, he fought Yamato and Terry inside Marda B's lair until Terry defeated him, breaking Marda B's influence.

In the Fire Spirits! storyline, Enjyu's appearance evolved: deep red hair, blue eyes, and a facial scar remained, now paired with a button-up purple top featuring lightning designs, red straps, and gloves with beaded wrist collars and metal knuckles. His hair was longer, tied in a ponytail. Personality-wise, he retained sarcasm and taunting but abandoned cheating, using any legitimate means to achieve goals while maintaining integrity. He reconnected with friends like Yamato, Terry, and Wen, showing less distress over his past. Enjyu participated in underground cage matches, intentionally losing for money, echoing his childhood. Gray confronted him, leading to a cage match where Enjyu used tactical knowledge to win the first round. Gray won the second, but Enjyu tapped into dormant anger and envy toward Yamato to win the final round. Post-match, he thanked Gray and severed ties with the underground league.

Later, Enjyu obtained the Black Drive Shot after battling Ludo, a mechanical entity. This encounter reignited his passion for B-Daman, destroying Ludo in the process. This outcome taught Ludo's friend Kevin a harsh lesson about loss and rivalry, while Enjyu focused on his goal of defeating Yamato.

Enjyu's battle record includes wins against Gray Michael Vincent in a cage match, a Mummy B-DaPlayer, and Ludo, alongside intentional losses in underground matches. His key battles span Direct Hit Battles, B-Daman Invasion, and Power Alley formats.