After six years, . They played in the mountains, visited the shrine, and were visited by the Ushi Oni Tooko just like in the past. Just as they were getting used to living in Monobeno, it was time for the Shichi Seisai summer festival dedicated to the local deity — the doctor and Alice's father, but nothing seemed wrong with her. They went to play in the nearby stream the next day. Hearing the waterfall caused Natsuha to panic and run in fear, but they couldn't find a reason for her peculiar actions. That night, she appeared in front of them very much an adult, and she bled in her nether regions for the first time. Unable to figure out what caused these inexplicable changes, they could only calm her down and watch over her. Another shock awaited them in the morning when they found Natsuha had returned to her normal size but without any memories of the day before. They decided to head back to the city for a proper examination. Unfortunately, a major landslide blocked off the only entrance to the village. Natsuha wished to leave badly, saying something scary was approaching her. What was causing Natsuha's changes? Was it a disease or a curse? Tooru was determined to find the cause and a way to save Natsuha.
