The noble lady Mimosa Alistera carries memories of a past life that ended prematurely due to illness.

Having gained a healthy body in this life, Mimosa is determined to be of use to someone. However, she is treated harshly by her family and fiancé, who brand her as "useless" because she can only master auxiliary-type Enchantment Magic.

But then, a young Hero appears before her. He tells her that he was saved by one of the paper cranes Mimosa had infused with her magic.

Could I actually have the power to help someone? Upon realizing this, Mimosa takes her first steps into a journey of helping others alongside the young man.