All I Remember it was a one shot manga, the setting was a school in earth with demi-humans and elves. Everybody thought the no one could use any magic except for an elf (which she really cant) and at the end of the manga a human used magic to open a door... I know its pretty boring plot for a one shot but I really want to read it again
i will add more detail to this: once for a while newborn babies will replaced with other worlder babies, like elf, beastman, harpy, winged people etc. because earth have no mana? so those children cant cast magic, except one elf that lying she can use magic because, yeah she an elf, supposedly good at magic. in one lunch? she want go to rooftop to have a lunch but the door locked, n meet one human boy bypass the door with the power of science, but the elf thought it was magic.