Chelsea has the special power to grow plants.
One day, she was suddenly recognized as a saint who would bring fertility to the land. She is taken up by the castle, but unable to fully display her powers she is forced to join the family of the Marquis of Alderman.

However, she is treated well by the marquises, a complete change from the cold treatment she received at the castle.
In particular, her brother-in-law, Dinan, is immediately attracted to Chelsea. He is in love with her every hour of every day...!
Then, miracles happen around them one after another...

Chelsea's cheat abilities are in full bloom due to her brother's doting love!
Love is running wild! A love story of a brother-in-law and an unaware cheat saint...
A different world love fantasy!