CitazioneIf you missed this quest during Route A and B you can trigger it again by going to 6-05 and from there you have to
1. Do the main quest till you're done talking to Pascal
2. Transport to Desert Camp and stop Emil and talk to him around this time you should also get a call from 6O regarding the Lunar Tear (Havent really tested if you need to stop and talk to Emil but better safe than sorry)
3. Go to the shopping mall near the tower and interact with the lunar tear.