Hell Girl/Heartwarming

• Courtesy of the final episode of Season 1. Ai attempts to expose Hajime as a hypocrite to his daughter Tsugumi by summoning a manifestation of his wife's car accident, to which we saw him responding in flashback "it's not my fault". This accident happened, mind you, after he rejected her attempt at reconcilement and she ran to her car crying. But when he sees the scene, he bursts into tears, emotionally crushed at the reminder that his wife died because he wouldn't forgive her. So Tsugumi decides to stand by her dad an rejects Ai's offer to send him to Hell.
• The (VERY) few episodes where someone doesn't end up in hell tend to have one of these as well.
• The episodes where Ai's companions show they care about her.