Last Embryo

A young man named Saigou Homura possesses a unique ability and receives a mysterious mail. Upon opening it, he is transported to a different world where deities and demons conduct games known as Gift Games. There, he meets a girl named Kuro Usagi and finds himself involved in a massive Gift Game. Alongside two others summoned with him, Ayazato Suzuka and Kudou Ayato, as well as Izayoi Sakamaki, whom he reconnects with after five years, Homura takes part in a game involving combat against gods and buddhas that affects the real world.