- Volume 7, 8, and 9 has Nakano Quintuplets' hand emphasizing their personalized finger on their face and touching the lips (from Quintuplets Finger Game):
- Ayane Sakura initially planned to voice all of the quintuplets in the anime. This was ultimately not implemented due to concerns over the stress that having to voice all the quintuplets would cause to Sakura's voice and throat. Source
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