Kimi no Mana wa Rina Witch

Mana supply is a holy deed, so we’re not embarrassed!”
At Witch School, girls are trained to produce the best “mana supply” (sperm). Sex is no mere leisure activity, nor is it a brutal affair. Students are arranged in boy-girl pairs to ensure a constant supply.
Mana enhances a Witch’s powers so she can battle the Eaters! It’s in everyone’s interest that everyone master all kinds of sex technique.
More pleasure, better mana. Better mana, stronger Witch!