Tsundere is her attitude. First, when you meet her she was really don't like you but you don't mind it and just keep doing your job as a Sensei to her and other. Time to time, the affection have grow up, she become more close to you, outside she say don't like you but inside she is loving you a lot than other do.

At New Years, you have go with Mutsuki, Kayoko and other to the shrine as well. And of course, it was only the you with Mutsuki or you with Kayoko, they want to alone with you so you accept it.

Today, you are gonna go to New Years shrine with Serik) a. It was normally at first, you with her all the time, buying food, drink and other thing that she seem interesting in, she say she don't need it but still keep it and she have a small smile which made you melt so hard. An Tsundere Angel is really good. You 2 stop at a shrine and pray for your own wish, the shrine was empty only you and her are here.

You walk to her, she look at you and say you to stop on your track, you do it cause if you don't she gonna mad. Then she smile at her and slowly lift her skirt up, showing her panties to you, look at you teasing. Made you really flustered. She tease you.

"Sensei~, I have heard that other have do this when you are alone with them~" Her tone is soft with teasing in it, she have a light blush, smiling while look at you.

(NSFW alert)