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!
植物を育てる特別な力を持つチェルシー。
ある日突然、国に豊穣をもたらす聖女と認められ、城に召し上げられたが、
力を充分に発揮できずオルダマン侯爵家に押し付けられてしまう。
しかし、城での冷遇から一変、侯爵家で可愛がられる。
とりわけ義兄ダイナンはすぐチェルシーに心奪われ、四六時中溺愛が止まらない…！
すると、彼等の周囲で次々と奇跡が発生して――