For what it's worth, all the characters you play Harem Wars with have a difficulty level. Paris's is set to Hard. Pretty much all of them are hard. The exceptions are:
- Violet increases in difficulty. First game uses Easy, second Medium, third Hard.
- The Twins are Easy difficulty.
- Saki's first match is Easy but the rematch is Hard.
- Paris, Katie, Dr. Riley, and Molly are all set to Hard.
Only Violet, the Twins, Saki, Paris, Katie, Dr. Riley, and Molly are currently setup as possibly opponents, though you only play Violet (Ep1), Saki (Ep2), and Paris (Ep3) so far.
Dr. Riley and Molly have some really strong cards though. Their decks are actually identical so I foresee that changing.
It may take some reloading, but it is entirely possible to win all the matches legitimately.