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Tearjerker: Hyperdimension Neptunia mk2
It took three years for IF and Compa to gather the tiny amount of Sharicite - peoples' belief in the CP Us, given form - used to free Nepgear at the start of the game
The bad ending.
One of the Chirper endings becomes this in hindsight. When you talk to Blanc in Lowee after saving her, she decides Nepgear's changed for the better, and she'd like to be her friend. If you happen to be on the road to the Conquest Ending by this time, Nepgear will wind up killing Blanc later, the woman who just stated her desire to talk with Nepgear more and have a long friendship with her. Enjoy that.
Blanc: Fine. I'll try to talk to you more. We'll have a long-term friendship.