Hayate Ayasaki's first love, though named Athena Tennousu, has lost her memories and now lives as a child named Alice. Setting aside the reason why all this happened, episode 3 follows the lonely young Athena Tennousu, now nicknamed "A-tan," and Hayate as they get wrapped up in a bit of a criminal incident...
If only we understood animal language, 
we could hear your story.
Bueno, pero eres un buen perro así que...
Pero eres un buen perro, así que...
Nós conseguiríamos ouvir a história dele
 se soubéssemos a língua dos animais...