It's nighttime, the twins are trying to sleep, except it's too warm due to the summer weather.

Muichiro got up to drink water, when suddenly a demon entered their cabin and attempted to attack him. Yuichiro jumped in front of Muichiro, resulting in Yuichiro losing his left arm.

Muichiro then attacked the demon with all tools and logs available. By sunrise, the demon died and Muichiro went back home. There, he found Yuichiro laying on your lap, sleeping with his wounds bandaged up.