Shinichi’s father tells him that he has arranged a fiancee for him.
However, he can’t help to be surprised when he learns that all of the
selected girls aren’t human at all. Wait, “all”? Yes, you read it right,
there isn’t just one fiancee, but four! There’s the lamia princess
Nadiusu the 12th, centaur knight Proxima, mechanical princess
R-Komadori, and lastly there’s the Gozen Tegusu, an arachne princess.
Alas, that’s not all yet. Shinichi’s father also tells him that if he
doesn’t choose a marriage partner, he will destroy the world. Thus,
with the fate of the world on his shoulders, the curtain rises for a
story of a boy seeking a bride amongst his non-human fiancees.