You would never expect the nicest ponies to become depressed. You would never expect the most innocent to murder the ones who were close. But it's happening, and these ponies are not ponies you want to see the bad side of.
When Twilight Sparkle is studying for her next test, Rarity gets involved and Twilight realizes she has feelings for the sophisticated mare. But what happens when your best friend betrays the close friendship you had?