Toyotomi Hideyoshi's suspension from the role of student council president acts as a catalyst for upheaval within Basara Academy. His abrupt removal creates an immediate leadership vacuum, plunging the student body into chaos and triggering fierce competition to seize control. This power vacuum ignites a school-wide struggle, with multiple factions and prominent students maneuvering for dominance over the vacant position.

Before his expulsion, Hideyoshi wielded significant influence as chairman, though the precise reasons for his suspension remain unknown. His absence fundamentally destabilizes the academy, fostering an environment of intense rivalry and opportunistic campaigning. Key candidates like Tokugawa Ieyasu and Ishida Mitsunari emerge as central figures exploiting the disorder to advance their ambitions. The resulting conflict extends beyond politics, permeating sports competitions and extracurricular activities where influence is contested.

Hideyoshi's expulsion, occurring alongside his associate Hanbei Takenaka, positions both as absent catalysts whose actions set the series' events in motion, rather than active participants in the current academy timeline. Student interactions and academy routines continue to reflect the profound impact of his removal, marked by heightened competition and fluid alliances. The unresolved nature of his departure fuels ongoing tensions, shaping character motivations and sustaining institutional instability.