Azusa works as a wedding planner. One day, she suddenly learned that her close friend Kanau had passed away. Because she could not recover from the bad news, Azusa could not proceed with her marriage with her boyfriend, Sumito. She continued to send messages to Kanau. Meanwhile, Kanau's parents, Tomoko and Yusaku, receive a card from the orphanage addressed to their deceased daughter. When Azusa is preparing a wedding anniversary event for a client, she suddenly remembers her middle school days with Kanau and sends a text message to Kanau saying that she cannot move forward without Kanau. Even though messages kept coming to Kanau, they were never marked as read.