As the battle went against Kagetora's force, Domanmaru's non-blood great-grandfather Norimasa UESUGI took Domanmaru to Kagekatsu's camp for peace negotiation, only to be murdered by the enemy warriors along with Norimasa.
景虎方の勢力が不利になってくると、義理の曾祖父・上杉憲政に連れられて景勝方の陣所に赴き和睦交渉に当たろうとするが、景勝の兵により、憲政と共に殺害された。