One day, in the middle of summer, I was planning to enjoy dinner with my wife's family at home, but while she went to pick up her mother-in-law, I was alone with my sister-in-law, Reiko... Reiko was beautiful and kind...I was desperately trying to keep her rational in that situation... While waiting for his girlfriend's wives, Reiko and I were about to open a can of beer when a large-scale power outage occurred. Due to a sudden accident, we end up spending the night alone, but I can't contain my excitement as Reiko cuddles up to me because she's afraid of the dark... *The contents may differ depending on the distribution method. Special feature