Complete guide to all Detective Points (DP) events in Chapter 4 of The Legend of Heroes: Trails from Zero, including main story and side quests, with DP values and conditions.
DP is the abbreviation for Detective Points, a value given to you for tasks you perform while doing your duty as the SSS. If you’ve played the Trails in the Sky or Trails of Cold Steel arcs, you will remember this as BP (Sky) and AP (Cold Steel) and it works the exact same way here.
The most common way of earning DP is via the completion of Quests, be it in main or side. More importantly, however, you can earn DP based on the choices you choose when asked questions along with performing optional objectives in boss battles such as defeating the boss in a certain number of turns. As you may expect, this means DP is missable and you don’t have much room to miss many if you want to get the top rank (and the Trophy/Achievements that come with it). Fortunately, this page will list every event that rewards DP for Chapter 4, along with links to find out more.
All Chapter 4 Day 1 DP
Main Story Events
| Event | Choice/Condition | DP |
| Ruins Investigation | Complete the Urgent Request | 3 |
| Mayor’s Request | Break through (2nd) | 2 |
Side Quest Events
| Quest | Availability | DP |
| State-Wide Overdue Book Retrieval | At the start of the day | 3 |
| A Sincere Favor | At the start of the day | 6 |
| West Crossbell Highway Monster Extermination | At the start of the day | 4 |
| A Present for Father (Hidden) | Speak with Cecile twice at St. Ursula Medical College (Room 304) | 3 |
All Chapter 4 Day 2 DP
Main Story Events
| Event | Choice/Condition | DP |
| Mayor’s Request (Part 2) | After the event at the casino, speak to Huey and Slash at Ignis (Downtown), Rixia at Arc en Ciel (Entertainment), and Sunita (Residential) before returning to the SSS | 2 |
| Mayor’s Request (Part 2) Report to Sergei | Assailants’ physical abilities (1st), Haphazard chain of command (3rd), Blue pills in Gantz’s possession (3rd) | 2 |
Side Quest Events
| Quest | Availability | DP |
| Search for an Important Person | Check the computer after giving Sergei your report | 12 |
| Flowers for Fallen Friends | Check the computer after giving Sergei your report | 3 |
| Getting a New Doll (Hidden) | Must have at least 288 DP (out of 303) and speak to Imelda at the Antique shop in the Back Alley | 8 |
All Chapter 4 Day 3 DP
Main Story Events
| Event | Choice/Condition | DP |
| Blue Pill Investigation | Complete the Urgent Request | 7 |
Side Quest Events
| Quest | Availability | DP |
| Orbal Staff Enhancement | At the start of the day | 4 |
| Stargazer’s Tower Monster Extermination | At the start of the day | 4 |
| Moon Temple Monster Extermination | At the start of the day | 4 |
| Ancient Battlefield Monster Extermination | At the start of the day | 4 |
Chapter Total DP
Below you can find out how much DP you can earn for this Chapter in total, along with the running total throughout the game and if any rewards become available during the chapter.
| Chapter | Game Total | Rewards |
| 71 | 343 | Strega-P (294), Power Suit (324) |
