Campaign Duration: October 18, 2023 18:00 ~ October 31, 2023 23:59 JST
Title: Grail Front: White Castle by Day, Black Castle by Night (聖杯戦線 ～白天の城、黒夜の城～??)
- The actual release of the event is on October 25, 2023 JST and its participation requires Lostbelt I cleared
- Duration: October 19, 2023 04:00 ~ October 26, 2023 03:59 JST
- Requirements: Clear Fuyuki
| Login Days | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|
| Present |  1
|
 1
|
 3
|
 3
|
 3
|
 2M
|
3
|
- Mission Duration: October 18, 2023 18:00 ~ October 31, 2023 23:59 JST
- Reward Duration: October 18, 2023 18:00 ~ November 7, 2023 23:59 JST
| Mission | Reward |
|---|---|
| Clear a total of 1 Arrow of any Main Quest from Arc 1 until Arc 2: Lostbelt 1 | 1
|
| Clear a total of 2 Arrows of any Main Quest from Arc 1 until Arc 2: Lostbelt 1 | 1
|
| Clear a total of 3 Arrows of any Main Quest from Arc 1 until Arc 2: Lostbelt 1 | 1
|
| Clear a total of 4 Arrows of any Main Quest from Arc 1 until Arc 2: Lostbelt 1 | 1
|
| Clear a total of 5 Arrows of any Main Quest from Arc 1 until Arc 2: Lostbelt 1 | 1
|
| Clear a total of 6 Arrows of any Main Quest from Arc 1 until Arc 2: Lostbelt 1 | 1
|
| Clear a total of 7 Arrows of any Main Quest from Arc 1 until Arc 2: Lostbelt 1 | 1
|
- Mission is autocompleted if the player has cleared all Lostbelt 1 Main Story Quests
- Arc 1.5 Main Quests do not count.
| Campaign | Duration |
|---|---|
| 0 AP for all Main Story Quests from Arc 1 until Arc 2: Lostbelt 1 (Arc 1.5 and Main Interlude not included) This campaign will override the 1/4 AP campaign from Ordeal Call Campaign Part 3 campaign (for Fuyuki until Lostbelt 1) |
October 18, 2023 18:00 ~ October 31, 2023 23:59 JST |
| Ember Gathering Daily Quest and Training Field Daily Quest Open All Day for Limited-Time EXTENDED DURATION |
October 18, 2023 18:00 ~ October 25, 2023 12:59 JST |
Event-Related Servants' Strengthening Quests 1/2 AP campaign  
|
October 18, 2023 18:00 ~ October 25, 2023 12:59 JST |
Event-Related Servants' Interlude 1/2 AP campaign 
|
October 18, 2023 18:00 ~ October 25, 2023 12:59 JST |
Event-Related Servants FP x2 Bonus    Double FP for both sides when picking related Servants as Support |
October 18, 2023 18:00 ~ October 25, 2023 12:59 JST |
| Event Servants List |
|---|
|
|
 and  for Event Servants during Grail Front: White Castle by Day, Black Castle by Night event
|
| Broadcast Title | Chaldean Broadcaster Lite Ver. Grail Front ~White Castle by Day, Black Castle by Night~ | |
|---|---|---|
| Fate/Grand Order カルデア放送局 ライト版 聖杯戦線 ～白天の城、黒夜の城～ | ||
| Broadcast Date | October 25, 2023 18:45 ~ JST | |
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Schedule:
- 18:45 ~ : pre program
- 19:00 ~ : main program
Casts:
- Kawasumi Ayako (VA: Artoria Pendragon and Variants, Lady Avalon)