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Tear Jerker: Jiraishin
When Chief Narita was killed by the assassin who received a heart transplant from his late daughter, Kyoya visits the morgue and kneels beside his corpse. He's clearly upset that he lost the man who had been friends with his late dad.
Poor Eriko lost her would-be husband at her wedding by her stalker.
When Kyoya is about to confront the assassin who killed Narita, Eriko tries to stop him and tells him that he's not alone. Ever since she lost her husband and her boss, she really doesn't want her partner to die. This even doubles as a heartwarming moment.