Kotegawa Yui/Plot

In the very beginning of her appearance since chapter 49, Yui practically behaved in a bossy way to anyone else, mostly Rito.

Later on, she became more friendly towards others after observing Rito's true kind nature. Since then, she has been developing feelings for him gradually over the series. As she had unconsciously fallen in love with Rito, she had finally admitted it in the series of Darkness.

Her love for Rito has significantly influenced herself in actions. as trying to learn more about him by reading his father's manga for talking to him about it.

She has come to understand that although Rito is interested in sexual actions, all his perverted incidents have been by complete accident, not on purpose, as Yui has become less angry with him when these cases happen.