Samurai's Duty

Realizing Corrin was telling the truth about saving what lives they could in Hoshido from the inside of Nohr's invasion, when confronted with Garon and Iago forcing Corrin to cut down his own brother, Ryoma instead chooses to commit seppuku to spare Corrin that fate. With his last words, he entrusts Corrin with stopping the invasion and Garon's madness.

Example of:
Heroic Suicide