The male protagonist of the student union, Sugizaki Keyu, thought he would be able to enjoy his special harem life in the familiar student council room today. However, when he arrived at the student council room, he found that there were many doubts here! President Sakurano Yurimu and others are missing. After entering the room, they cannot get out. There is a layer of mysterious gray fog outside the window. There are many unread light novels, comics and CDs on my bookshelf, as well as the red button on the president's desk that should not exist. There are even many memories in my mind that do not belong to me! Is this a joke from an angel or a prank from the devil?