★The 22nd Japan HORROR Novel Contest Reader Award, a heart-wrenching work. ★A tear-jerking, melancholy horror novel. ★No.1 among bookstore clerks! ‧"Every page is a must-see, touching story."‧"The book is full of reasoning elements, which is very much in line with my preferences."‧"I have a feeling that this work will become a representative work of melancholy horror novels, and I recommend it to readers who want to read touching horror novels."Do you have a memory you want to forget? After losing this memory, are you still you? College student Ryoichi loves senior sister Kyoko who suffers from severe nighttime phobia. Ryoichi patiently accompanies her, hoping to cure Kyoko's phobia. However, Kyoko puts her hope on the urban legend "Memory Messenger" - according to the legend, the Memory Messenger can help people erase the memories they want to forget. One day, Kyoko can walk home at night by herself. It seems that she has cured her phobia, but she has completely forgotten about Ryoichi. Ryoichi begins to search for the truth and discovers that his childhood friend and neighbor Maki seems to have lost an important memory. In addition, there is an incredible blank gap in his own brain. Is the "Memory Messenger" an invisible brain surgery? Or is it the legendary weirdo who can "eat" memories? While Ryoichi is trying to track it down, he shudders to find that the Memory Messenger has been lurking beside him, staring at him...