Risou no Himo Seikatsu

Summoned by a beautiful woman to a different world, Yamai Zenjirou is asked to marry her and make a child with her. He agrees and is sent back to his home for one full month to get his affairs in order. He has a limit on what he can bring with him, so he carefully makes his selection, returns to the world at the appointed time, and begins a new life as the Prince Consort of Queen Aura.