Happy Trouble Wedding

19-year-old Narika Esikava lived a poor life with his mother's mother. But when the mother of Narica died, she was forced to follow the lifestyle of his mother, who, unfortunately, also included her debts. One night, men come to his door and require 3 million yen, which Mother Narica lean from them. A strange man saves her who pays money to men and tells Narica that he has just "bought her" and that if she marries him, he will give her everything he wants! What exactly is happening?