HuniePop

Game Cheats:

Unlock Secret Characters
The following hidden characters are unlocked by completing the corresponding task.

Momo:
Buy the 'Goldfish' from the store and then attempt to discard them during the day.

Celeste:
Give Kyu your 'Dirty Magazine' after unlocking her to gain the 'Strange Object'. Attempt to give this to someone at the beach during the night.

Venus:
Have every other non-secret character spend the night over.

Kyu:
Have a woman spend the night over.