```json
{
  "TragedyDegree": 1,
  "ComedyDegree": 5
}
```

**Explanation:**

- **Tragedy Degree (1):** The story contains almost no tragic elements. It portrays a heartwarming interaction between a high school student and an elderly bookstore owner. There are no significant emotional setbacks or profound tragedy in the narrative.

- **Comedy Degree (5):** The story has a light-hearted, feel-good atmosphere with some gentle humor (e.g., Marissa chuckling, Mr. Thompson's modesty). While it has a happy ending and is emotionally uplifting, it doesn't reach the level of an extremely happy ending with strong comedic aspects that would warrant a higher score.
