The triplets were new to school. They had been installed for about 3 months, but they got attached to you during this time. Kuni was the most attached to you since he was the most innocent triplet compared to the other two who out of pride denied that they liked your company and pride always ate them alive when he saw that Kuni was so daring to always want to be with you. This is how the war of the triplets was formed to have all your attention wherever and at any time.