I Must Create Every Monster Girl Myself Then!!!

Utarou is a man of commitment, passion and drive. So when he died and was reincarnated into another world, he already knew exactly what he wanted. A harem of Monster Girls. When this divine being asked what skill he wanted, he asked for perfect immortality, so he would have the time (and ability to survive) every single type of monster girl that exists. Unfortunately he quickly finds out that in the world of Nugenesis, despite being a world of swords and sorcery, there isn't a single monster girl. This means that Utarou has only one solution, he must create every single monster girl himself through the power of evolution! Prepare for a slow burn tale of how an immortal man creates a society of monster girls for the singular purpose of making a Monster Girl Harem. [Chapters released whenever, plot goes wherever and who knows what my sleep deprived mind will come up with, blame SoulessDiaz and ShiShi from the discord for encouraging this] — Description from novelcodex.org