A 40-year-old unknown single man died after losing consciousness from excessive masturbation. When he regained awareness, a cute girl was watching over him with a worried expression. Her name is Misha, and she calls him Norn. According to Misha, he was nearly drowning in a river, but reflected on the water's surface was the figure of a boy with beast ears. He has been reincarnated into this world and given the new name Norn. In this world, all residents possess animal ears and tails, females vastly outnumber males, and polygamy is the norm. Misha is destined to be Norn's first wife. Though they haven't yet held a wedding ceremony, they already live together, sharing every moment of daily life. Misha washes Norn's body without hesitation, touching even his groin. These touches gradually stimulate Norn's body, building his excitement higher and higher.