Yasuda Yutaka, on his way home from work, accidentally goes through a portal which suddenly appeared before him. On the other side, a completely different mysterious world! It's been five years since then and he still hasn't figured out the way back. To earn a living, he opened an okonomiyaki shop which is doing really well, so he's also getting used to life in this world.

However, he has a problem. Many suitors come knocking, fixated upon him for his black hair and black eyes which are considered rare in this world! And – the way to propose is to have a duel! Because of that, his life has hung on the balance many times until he's driven into a corner when the strongest suitor finally makes his appearance…!