Head regent’s oath and resignation rule

The Head regent’s oath and resignation rule connects the president’s personal duty to the legal authority of the Council of Regents. Toranaga explains that a vote against him by the other four regents would bind him, as president, to obey their order to commit seppuku; his countermeasure is to resign formally before that obligation can be enforced.

The President’s Oath

The rule makes the president’s office a source of both authority and peril. When Hiro-matsu warns that the regents can impeach Toranaga even if he escapes, and that he will therefore be ordered to commit seppuku, Toranaga accepts the force of the oath: if the four vote against him, he is bound to comply. The threat is not merely political removal; the council’s decision could become a command over his life.

Resignation as an Exit

Toranaga says the Taikō never forbade him to resign. To put that distinction into effect, he gives Hiro-matsu a formal resignation on a rolled parchment and the official seal of his office as president, with instructions to deliver both to Ishido once the escape becomes known. Toranaga’s argument is that resignation releases him from the oath attached to the regency. The prepared document and seal make withdrawal a formal act, not simply a refusal to obey the council.

The Vacant Fifth Seat

Resignation also changes the council’s ability to govern. The Taikō’s testament established five regents, and Toranaga argues that the remaining four cannot exercise the Emperor’s mandate until they elect or appoint a fifth. Ishido, Kiyama, Onoshi, and Sugiyama must agree on the replacement; because the new member must be acceptable to all four, choosing one becomes a point of collective dependence. Toranaga expects their inability to agree to prevent decisions while he is no longer bound by the regent’s oath. The rule thus turns resignation into more than personal escape: it creates a vacancy that can obstruct the very authority being used against him.