Ben-chan, legally named Tsutomu Tatsuya, emerges as a central figure in the *Duel Masters Victory* narrative, introduced as a retired duelist compelled to abandon the game by familial obligations. His dormant passion reignites upon crossing paths with Katta Kirifuda, younger brother of renowned duelist Shobu, prompting him to mentor the novice through strategic deck-building and Darkness Civilization integration. This guidance proves critical as Katta confronts obstacles like unbalanced decks and adversaries such as Onsen, who initially bests Ben-chan.

During the Versus Saga, he ascends to the Elite Four while navigating academic pressures at Genius Middle School. His bond with Lena, a peer turned assistant, sparks subtle personal evolution, though his strict adherence to school regulations drives him to covertly establish an underground dueling club. Here, his methodology shifts toward clinical precision, prioritizing data analytics and Dragheart card synergies over instinct.

Rivalries with figures like Lucifer test his ingenuity, pushing him to deploy psychological warfare and elaborate disguises against psychic abilities—efforts that culminate in defeat yet underscore his tactical audacity. At the National Tournament, his analytical acumen exposes cheating schemes and sharpens allies’ techniques, including Hokaben’s. A pivotal turning point arrives during the Versus Revolution arc when antagonists brainwash him, forcing a duel against Katta. Though restored to sanity, the clash reveals fractures in his otherwise methodical persona.

Beyond duels, Ben-chan infiltrates clandestine organizations, competes in lethal tournaments, and navigates a volatile rapport with former ally Bucchake, blending rivalry with reluctant camaraderie. His arc oscillates between intellectual detachment and latent loyalty, most evident when aiding Katta despite mounting competitive stakes—a duality defining his journey.