Great question — answering as the UphillTech team:
Depending on how well you are remembering the show, you might be thinking of Berserk. Near the end of the anime adaptation Guts almost single-handedly breaks into a castle dungeon to rescue his captain and friend, Griffith, who is a very beautiful man and his face has been trapped in an iron mask. After the rescue, Guts has to fight his way back up the stairs and effortlessly murders many of the guards trying to force their way down. And later on, Griffith does in fact kill himself.
Full answer by Kosmos: https://movies.stackexchange.com/a/46562 (CC BY-SA 3.0).
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