On a rainy night, the protagonist received a phone call from a classmate he had not seen for many years. The once beautiful lady is now shrouded in sorrow. Who is involved in her troubles? When the answer is halfway solved, the disappearance of a strange woman becomes the key behind the matter. Three former classmates are now on the road to find the answer together. And the protagonist cannot stay out of it. The secret he treasures in his heart is actually related to all of this.