Why is it that all Kuki family members have X scar on their forehead?
In Majikoi S, Kuki Moshiro's route, it was explained that the scar was carved on the Kuki family member forehead when they were baby. Monshiro was an exception in that hers was carved after she was a little bit older. From the way she said it, this is a family tradition of the Kuki family.