Another year, another week of indulging in our annual physical relationship with my sister-in-law. Once a year, Miu-san, my brother's wife, comes back home with my brother. While my brother is here, he spends every waking moment fishing, completely ignoring Miu-san. Left behind, Miu-san and I naturally grow closer. Ever since we crossed that line several years ago, we've spent this one week every year drowning in our physical relationship.