The protagonist of the memory loss, My identity is not an I don know, The educational institution follows it including Touko Yoshii of the homeroom teacher, It spent it without the inconvenience. However, Because it doesn have the memory, it cannot have the dream and hope, I felt emptiness without the thing to attach too much importance to to what. And from an accidental thing, I lose ones memory taking advantage of a certain event, It knows it is something that is in which it happens in the educational institution, As a tedious killing time of every day, It begins to search for the that event.

To obtain evidence, Though it sneaks in to the staff room at night, It is found by Touko. To Touko that criticizes me, The protagonist reveals feelings that it is not possible to endure empty every day, The event is cross examined over again. However, Touko gets excited too, Because the fatigue to which the homeroom teacher of the protagonist that had gotten to the memory loss was done was vomited, the protagonist was blamed. The protagonist that knows the real intention of Touko, It springs strongly from the bottom of the heart and the piercing movement to sadism passion that goes up, She is violated. Strong impulse obtained for the first time after it loses ones memory, The protagonist that obtains the excitement and pleasure, Thus only pleasure that violates the woman, It finds it in case of the essence of me lost. And as the desire to awake goes, It begins to have moved when violating it as tragically as other female teacher [tachimo] Touko.