Mahou Shoujo Ikusei Keikaku: Restart

Sixteen Magical Girls are gathered inside a new game that gives them no simple way to walk away. Every three days, their Magical Phones pull them into an RPG-like world where they fight enemies, solve puzzles, and collect Magical Candy in order to advance together.

Cooperation begins cracking when they learn that ten billion yen waits at the end, and only the players who land the finishing blow can claim it. Friendships and alliances become possible betrayals, while every choice between helping another player and getting ahead carries a real cost. Worse, losing all of their hit points means far more than a simple game over. Under brutal rules and growing suspicion, each girl must decide whom she can trust and what is worth risking her life for.