Train45 Black Bikini / Changing Room Guide
Searches for 黒いビキニ, 黑色比基尼, Changing Room, or 更衣室 land here. Digits are on the swimsuit — but Mai’s affection-7 event must fire first.
Why Mai Gates a Reina Scene
Black Bikini is a Reina swimsuit CG, yet the item only appears after you clear Mai’s affection-7 intimacy event. Then the swimsuit digits give route 30-28-10. Bring Reina to the Changing Room door — not Mai.
Players who finish Reina’s Hot Spring and Pet Car first still hit a silent reject until Mai Lv7 is done. Plan both heroines on First Playthrough.
Route 30-28-10
Queue 30-28-10. Unequip the Copper Bracelet. Japanese boards list that walking order; the phone usually accepts the same set either way.
| Car | Anomaly | Role |
|---|---|---|
| 30 | Doll / mannequin | First bikini digit |
| 28 | Exit advertisement | Second digit |
| 10 | Reverse / wrong-way | Third digit — Changing Room door |
First visit still raises capacity. Gallery rules until Patch Note 4: Event Dialogue Replay. Named Steam patch as of 30 August 2026 remains v1.0.5.1.
Related Reina Terminals
Earlier Reina beats: Hot Spring (15-1-27, wall 54) and Pet Car (6-17-23-28). Nursing Room (4-5-8-12) is a separate chapter-5 lost-box chain with Reina.
Full code table: Puzzle Solutions.
Related Pages
Frequently Asked Questions
What is the Train45 Black Bikini code?
After Mai’s affection-7 event unlocks the swimsuit, queue 30-28-10 and bring Reina.
Why is the Changing Room locked after Pet Car?
Black Bikini waits for Mai affection 7 even though Reina owns the CG. Clear Mai’s Lv7 event first.
Do I bring Mai or Reina?
Reina at the door. Mai only unlocks the item via her Lv7 event.
Is 更衣室 the same as the Hot Spring?
No. Hot Spring is 15-1-27. Changing Room / Black Bikini is 30-28-10.
Video Walkthrough
Watch the six verified gameplay videos below to see these strategies in action.
All Secret Anomalies, Traps, and Scenes | Train 45
