Cute and simple Tomo Masaka has a complex of brothers and sisters, Tomo loves her elder brother EI, that he learned a lot to enter the Kouryou Academy, where EI is the popular chairman of the student and senior council. Now the dedication of the existence of Tomo-best friend of the IG and Vice President of the Student Council Motoki Izumi. For some reason, Izumi always mocks and mocks Tomo every time he comes to the student board room to visit his brother. Why can't Izumi can just stop him and leave him alone? What is more importantly, why the heart Tomo beats every time Izumi scares him? Sometimes Izumi is even kind to Tomo, which only makes his heart beat faster!