How does the author of the Shri Sai Satcharitra introduce the story of Damu Anna, and what does he want the reader to learn from it?

The author introduces the story of Damu Anna as a prime example of Sai Baba's immense love and protective nature towards His followers. In Chapter 25, it is presented as a report that will fill the listener's heart with joy and demonstrate how the "Guru-Mother is an 'Ocean of Mercy.'" The author promises that this short yet meaningful story will make one's difficulties vanish. The stated purpose of sharing this narrative is to show that when a devotee establishes one-pointed faith, Sai wards off all their misfortunes, removes their suffering, and grants their desired objects, illustrating Sai's readiness to protect His devotees.