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Tear Jerker: Chis Sweet Home
Episode 102.
Episode 103; and the first few episodes of New Address.
Do not, do not, do not watch episode 103 if you've recently lost a pet. This troper can't watch this show anymore because it's all one big Tear Jerker.
It's not like anybody dies. All that happens is Chi's friend Blackie moves away, and she gets over it fast..."I can't see him, but he's there!"