The Soft and Cuddly Little One Coasts to Victory in a Period Novel

Manni has an eldest brother serving in the military, but he will die in action three years from now;

Manni also has a second brother at home, but one encounter with the heroine will ruin his whole life;

Manni also has an older sister who is desperate to get married, but she will die after suffering domestic abuse;

Manni also has a bookish third brother, but one day he will lose the use of his hands and feet and be disabled for life;

Most importantly of all, Manni has a mother who transmigrated here!

As for Manni herself...