She spent time alone with her sister-in-law, who was going through a rough patch with her brother, and crossed an insurmountable line. (Akari Tsumugi ADN-251)

I told my brother I wanted to go camping, but I ended up spending time alone with my sister-in-law, which made me uneasy... When I went camping with my brother and his wife, a sudden storm hit. Even after taking shelter in a mountain cabin, the situation didn't change. Deep in the mountains where there was no cell phone signal, my brother decided to descend the mountain alone to find help...