ib -インスタントバレット-

Kuro Fukase is a despairing young man convinced the world deserves to end, haunted by the Ayakura sisters, Toiro and Iroha, the only family he had until a fire killed them. On Christmas Eve he meets the cheerful Sera Himeura and a witch named Yume Furusuna, who tell him he is one of twenty Instant Bullets, people handed the power to destroy the world. Some of the twenty want to save it instead, and Fukase's own wish has not changed.