Magical Girl Raising Project, Vol. 2 (light novel), Volume 2

A popular social network game called the Magical Girl Raising Project can grant players a chance of becoming a real-life magical girl, however, the administration soon decides they will cut the number in half by having the magical girl with the fewest Magical Candies each week lose their powers.
(Volume 1)The hit social network game "The Magical Girl Raising Project" selects one out of every tens of thousands of players to become a real life magical girl. The lucky chosen girls gain magic powers as well as incredibly good fortune, and spend their days blissfully. But one day, an absolute announcement declares that the number of magical girls has risen too high and must be cut down to half. Sixteen young maidens are thrust into a merciless, deadly contest to survive...but how many will come out the other side?