Kikou Sentai Edelstein

The protagonist meets a well-known senior at the high school he enrolls in. He's not particularly good-looking, and in fact, his white coat and glasses give him a strange aura. For some reason, this senior is the object of admiration from the female students. According to his friends, he's a world-class genius. Without warning, the senior taps the protagonist on the shoulder. And then he says just this: "Would you like to be my pink?" "Yes?" From that day on, evil fighters appear, ignoring the protagonist's wishes, and the protagonist is inevitably drawn into daily battles. [Roughly translated from the Official Website.]