Reverse 1999 The Midnight Whistle has returned in Version 3.8, with its story, challenge battles and Ironheart of the Danube event shop. Finish main story 1ST-16, Heaven Apostles to unlock the rerun.
The event runs from 23 October to 5 November 2026. Complete challenges to collect Ironheart, then exchange it for rewards including Unilog and growth materials. The deadline falls in the UK morning.
Reverse 1999 The Midnight Whistle unlock requirements

To unlock The Midnight Whistle, complete 1ST-16, Heaven Apostles. If the event is locked, check your story progression first rather than assuming you need a new character or a paid ticket.
After clearing that chapter, open the current Version 3.8 event menu and select The Midnight Whistle. You’ll find returning story content and challenge stages, with rewards shown in the rerun’s own event area.
This is a rerun, but the dates are new. Reverse 1999 The Midnight Whistle in Version 3.8 uses the 23 October to 5 November window; an old guide from the original release can give you the wrong deadline.
How to earn Ironheart of the Danube
Complete the event’s challenge battles to earn Ironheart of the Danube. Bluepoch specifically confirms challenges as the source of this currency in the Version 3.8 rerun announcement.
Start by clearing the story stages you have available, then move into the challenges. Check the Ironheart reward shown for each battle and collect what you’ve earned before visiting the exchange shop.
If you don’t have much time left, look at the currency required for your preferred reward and compare it with your remaining challenges. The rerun notice doesn’t provide a complete stage-by-stage farming table, so the live event panel is the right place for the amounts.
Keep the currencies separate. Reverse 1999 The Midnight Whistle uses Ironheart of the Danube, while The Temporal Scale uses Plumb Line. You cannot spend one event’s currency in the other’s exchange shop.
Reverse 1999 The Midnight Whistle exchange shop rewards

The rerun shop includes Unilog and growth materials. Enter its exchange screen to see the current stock and prices, then spend the Ironheart you’ve collected.
Unilog can help with future summons; growth materials are useful if you’re raising characters now. Choose based on what’s left in your shop and how much currency you have, rather than following an old purchase order.
The original run’s shop contents and costs aren’t a verified price list for Version 3.8. Check the live rerun exchange screen before deciding what you can still afford.
After each clear, check whether your Ironheart has been added or needs claiming through the event interface. You want the currency in hand before the rerun closes.
What content returns in The Midnight Whistle rerun?
Yes, the limited rerun includes story and challenge stages. Bluepoch explicitly confirms both types of content are available during the event.
Work through the stages you’ve unlocked. If a challenge is unavailable, read the requirement displayed beside it; there isn’t a publisher-verified universal order for every battle in this rerun.
If you played the original event, check your current progress before repeating anything. The Version 3.8 announcement doesn’t specify how old stage completions are handled, so don’t assume a full reset or an automatic extra reward.
Reverse 1999 The Midnight Whistle UK end time
Reverse 1999 The Midnight Whistle runs from 23 October at 05:00 UTC-5 until 5 November 2026 at 04:59 UTC-5. That’s 09:59 GMT in Britain and 10:59 CET in Central Europe on Thursday 5 November.
The deadline is in the UK morning. Bluepoch doesn’t list a separate rerun-shop grace period, so finish your challenges and make any remaining exchanges before it ends.
Puppet Arena and several other Version 3.8 activities share the same 5 November date, but use different progression and rewards. Check each activity’s claim screen separately.
For Reverse 1999 The Midnight Whistle, finish Heaven Apostles, open the rerun, clear its challenges and exchange Ironheart of the Danube for the rewards you want before 09:59 GMT on 5 November.
Official source: Bluepoch Version 3.8 Midnight Whistle rerun announcement.
