Mizuhara Ryo is a normal high school student. He was eating diner with his little sister, Akane, happily as usual...until a mysterious beautiful girl Masuda Shizuka suddenly broke into the room through the window. While they were surprised at sudden appearance of the strange guest, Shizuka said courteously that she was the bride elect of Ryo. Then, in order to accomplish a secret national project, men in black suits broke into the room.