Histoire
Fumiya was troubled by his sex life with his wife. Though he adored her, he simply couldn't respond during sex. The couple had no children and suffered daily pressure from relatives. Then one day, the government abruptly tore them apart, forcing each to cohabit with a 'new partner'. It was state-sanctioned adultery, implemented as part of measures to combat the declining birth rate! Note: Includes one extra chapter.
Synopsis via AniList (en anglais).