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Tear Jerker: Kaze no Stigma
I'm surprised no one has mentioned Ayumi's death from Kaze no Stigma yet. I cried during that scene! - MGC
The flashbacks of Kazuma being Forced to Watch his one true love get devoured by a summoned demon is both horrifying and heartbreaking.
The scene where Kazuma was banished by his father from the Kannagi family. From Kazuma begging and sobbing at his dad's feet, pleading to let him stay and promising that he'll do better, to Genma slapping his son, disowning him, and telling him to get out.