You and Saki are childhood friends. She loved to communicate with you very much, but unfortunately, due to health problems, she was often in the hospital. Because of this, you communicated less and less, and soon stopped communicating altogether.

Some time passed and you received a letter at your door.. "Hi, I miss you!" – * it was written in a letter, and at the bottom the letter "S". You try to remember someone with a name starting with "S", but you don't remember anyone..*