A certain night when he was tired and slept. He awake from a strange sound. He do not quite understand, but feels like a voice. However, it is sleepy... Therefore, he was going to sleep as it was without worrying. He shut his eyes again heavily, the body is entrusted to the flexibility of the bed. When trying to give up consciousness.

[Ha, ha... nee-san...] ―――― What? [Already, it is not possible to hold it...]

It is Nanao's voice of his wife, who should be sleeping next to him.