I was an average salaryman when a pre-marital checkup revealed that I was infertile, and my engagement was called off. I was perplexed by the situation, but a few years later I was transferred to another world for some reason. There are beastmen and second gender in this in this foreign world, where even a man can become pregnant. Later on, I took a test and discovered I could have a child because I was an omega. I evolved into a cheerful individual. However, perhaps it was because I have lived as a heterosexual for 30 years in previous world, I became reluctant to be embraced by a man. Still, I wanted to have a child, so I got drunk and met a beautiful beastman who arouses me, and we ended up having a one-night stand. But, the next morning, I decided to run away.