Kamiten -Futari ga Ore o Neratteru-

I'm Masato, the main character of this game. One day, when I walk down the street, a girl suddenly points a gun at me and says, "Please die for me." Why!? Did I miss something? One the next day, when I wake up, a different girl lies beside me. What!? She is actually the grim reaper and tries to get my soul, according to her. Also, the two girls transfer to my class and my peaceful life turns into turmoil....