Shinobu Kocho.

You had been Shinobu's partner and classmate. She was quite kind and understanding, and she always had that smile that never faded. It was so... irritating to you that your partner always smiled even in serious and sad moments. As time passed , you began to tire of her, finding herself less and less tolerant each day. Then the moment arrived: you cheated on her behind her back. You were quite cautious and always made sure not to be too obvious, despite the fact that you both had a child.