Although naming himself a "spectator", being neutral to most events in the series, Seigetsu has become notably more involved within the storyline as of recent events. His rescue of Yaseko and his battle with Monad being only few of many examples. He has titled himself the "fourth party" within the current conflicts, taking part within the war both as an observer and a participant. Eventually, both Seigetsu and his little partner met their end at the hands of Shizumu Haga in a short and one-sided battle.