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*SPOILER ALERT*

If I remember correctly. First of all you need to transform into futa with machine in Abraxas. And secondly you can pounce only girl with purple hair (It's located at the beginning of a location with red paper lanterns, if I remember correctly it's called China town, but I may be mistaken with the name. And Abraxas you can find in the end of the city to the left)

you can also pounce the white haired girl if you battle her in the abraxa room