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Tear Jerker: Petite Princess Yucie
Episode 3 has Dan the baker and Mimy's backstories, with him never being around for special moments when she needed him there.
Eoisode 8 has Cocoloo's insecurities over being a ghost, chosen as a model, and as a Platinum Princess candidate.
Episode 9 has Elmina expressing surprise over Gunbard clapping for Yucie despite mistakes, and that she calls him 'dad'.
Elmina's backstory, with her parents having high expectations, can be enough to bring tears. In episode 12 when she went home to Fluffy Cloud Heaven, she imagines a bunch of disembodied faces laughing at her while she tries to do the dance she couldn't do as a child, causing her to mess up and break down crying, saying "I made...a mistake..."
In a later episode, she flashes back to that same day...but her robot butler picked her up and carried her off, asking her to do the dance just for him. When Elmina protests, saying she messed up, it wasn't perfect, he tells her that he's sure it will be just fine even so.
Episode 13 has Glenda resolving to help Amphi even when it appears he has a lover.
The second-last episode, where Yucie's friends gave her no choice but to use the Tiara to save Arc, after secretly making a promise that would erase all her memories of them so she could make the wish without guilt. Because making the wish would cause them to disappear.
The last episode has Yucie remembering her friends and how they ceased to exist once she made her wish.
The ending theme, "Because I Cannot Say It."
Taken Up to Eleven in episode 25's ending, where it reverts to the pre-episode 14 ending because the other girls were erased.