Komari Gao no Onzoushi ni Kyuukonsaremashita

Hikari can't leave a person in need alone. She finds a man crouching on the street just before her job interview. When she reunites with the man at a later, he suddenly proposes to her, "I want you to help me." She can't leave the troubled person alone and Hikari decides to marry the person she doesn't know after 0 days of dating. What are the troubling circumstances that Soshi has!?