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Challenge: It's a fantasy world with mana transfer, if you know what I mean.
Girls get magical powers by receiving mana from their lovers, but it only works with the guys they lost their virginities to, or pre-processed mana from other girls. Guys produce mana, but can't use it themselves unless they become wizards (virgins over 30). How would your characters deal with such madness? Will the competition create yandere harems?
